This is a pretty cool match actually. No kidding, the idea is cool for how different their fighting styles actually are.
LONG ASS POST AHEAD
A couple of questions first:
-It's composite X, right? I mean, it's fair given it's composite Link using all his tools and weapons, skills and abilities, so X should have access to all his weapons, armors, trinkets and experiences (that would be Z-Era X).
-Does X have access to the Mother Elf? This is a huge asset for X so it's important to know.
-How do they measure up in AP and Durability? Who stronger and more resistant and by how much?
Okay, how I see things:
Link is pretty versatile, everyone knows that, but it's close combat where he shines the most and his ranged combat while excellent is, for the most part, in assistance of his close ranged one. X, on the other hand, is an expert martial artist and has skill with short-range weapons as seen he has his own spin with the Z-Saber, but he is first and foremost a marksman and most of his fighting style revolves around keeping his distance and gunning down his opponent with his varied weapons. Both share similar aspect in strategies: scouting for openings or weak points, analyzing patterns and looking for the best tactics to exploit them
(noticeably, taking advantage when enemies seem vulnerable, stop or seem to be preparing an attack). From what I see here, the fight would be mostly trying to stay away from Link and attack from afar, while Link tries to close in and get an infight, using his own projectiles to fight back but also to help him to close in.
Individually:
Link:
Pros:
-Important advantage at close combat
-Has ways of one shotting X with the Ancient Arrow and the Annihilator
-Does have ways of closing in like the Hookshot and variations and the Magnetic Gloves (though, apparently, he can't use the gloves and the Shield and the same time so he has to switch between them)
-Resists Elemental Damage, allowing him to hold on against several of X's weapons
-More reliable healing, magic restoring and Regenerationn and a much larger pool of it.
-More versatile hax with a much larger arsenal
-Mirror Shield and barriers can deflect a good part of X energy projectiles -Can set up traps with several of his items to control terrai
-Nobuyuki Hiyama
Cons:
-Lower stamina
-Limited ammo and magic despite having large amounts of both
-Outclassed at long range combat
-Most if not all of his projectiles can be stopped or blocked
X
Pros:
-Important advantage at ranged combat
-Has many ways to keep his distance, push Link away or escape if caught.
-Has many shields and defenses of his own to protect himself from incoming projectiles and attacks to keep his long-range advantage. Can also shot down projectiles thrown at him, even energy ones thanks to chips, parts, armor parts and shields, and barriers.
-Unlimited Ammo thanks to the X8's Ultimate Armor and the Fourth Armor (assuming composite X is used). Fourth Armor does spend weapon energy on charged special weapons, but the X8 Ultimate Armor does indeed give unlimited ammo even on charged uses. -Essentially unlimited stamina thanks to the mother elf (and incredibly high on his own too)
-Many of his projectiles can work around the Mirror Shield, being explosives, blades, liquids, liquids and the black holes.
-Several of his weapons break barriers and defenses. -Parts, Chips and certain armor parts allow for quick charge of special weapons adding versatility.
-Absolute Zero and Heat Attacks may be deadly to Link (I may be wrong on this one, though, correct me if I am wrong, but Link's profile, while it does state he resists Ice and Fire manipulation, it doesn't mention Absolute Zero and X's fire has been stated to
be hotter than the Earth's Core and Absolute Zero temperatures, and resistances are not immunities unless explicitly so).
-Flight thanks to the Falcon Armor's Foot Parts (Assuming this is composite X)
-Is debatably agiler? (Not faster, given speed is equalized, but X's fighting style does involve a lot of dashing, wall climbing, jumping, multi air dashing and running around while attacking)
Cons:
-Outclassed at close combat, though not helpless and can fight back, but if things drag out Link has it in the bag.
-Own Regenerationn can be stopped by the Master Sword
-Much more limited healing
-Energy Projectiles can be reflected by the Mirror Shield while Metallic Ones can be repelled with the magnetic gloves
-Being made of metal the Magnetic Gloves can be an issue
-No longer voiced by Mark Gatha, more relevant in his case given unlike Link who is a silent hero, it becomes noticeable as X keeps speaking roles.
This is assuming X does have the Shoryuken, the Hadouken and the Nova Strike, but taking their One Hit Kill as gameplay as well as X's ability to use non-stop the Nova Strike (and that it recharges during battle instead).
Neutral:
-Both resist each other's mind and soul manipulation. Both are immune to time slow and stop and transmutation.
-Both seem to be around equally experienced. Maaaaaaaaybe, X has an edge here by virtue of having been fighting all sort of Mavericks non stop for over a century and then jumping straight into the Elf Wars for another 4. However, you could argue that Link, despite less time fighting, has faced more varied enemies due to having more games. Still, given the nature of each side (full technology vs magic with technological bits) they can surprise each other perfectly well.
If you ask me this could go either way, I almost would even say it would be inconclusive. But, I guess I'll barely go with X on this one mostly because if he plays his cards right he can outlast Link. Speed is equalized and assuming both are even in terms of power and durability or at least even enough to avoid easy one shootings, X has two big advantages: much higher stamina and unlimited ammo. While Link can fight offensively or defensively perfectly fine as however he needs, X is a much more defensive fighter (something the games themselves tell the player and even encourage) and given how good his long-range combat is his endurance advantage can prove key; he can play it safe to avoid Link's most lethal moves and still slowly crawl to his victory, Link on the other hand by being defensive can avoid all risks but won't get anywhere and will eventually tire out, his option is to
take more risks and spend more of his resources and energy in trying to catch X and finish him off in Close Combat where he has a huge advantage.
Huff... long post is long... Keep in mind this is how I see things. I may be missing things given Link has 1000+ gadgets in his belt already is hard to keep track of all of them if you have missed a Zelda game =P