Dooyo said:
The fact that he is much more durable + stronger physically than her.
He has Regenerationn which will makes her attack pratically useless in a long run, he also has revenge counter.
He can also nuke the area with his Darkness attack ( which can makes easily 30000 feet deep casually when he isn't mad lol ).
Currently, he is 10 times stronger than before + he is casually Island level. He can also summon his clone which is also as strong as his past self which was already capable of erase Danafor.
All in all, he destroy her, he has all the cards to win this match.
Don't forget his vastly higher speed which would allow him to speed blitz her and evade all of her attacks easily. His regen isn't infinite but he has seven hearts which must be destroyed for him to die, that or decapitation or getting stabbed in the brain, and even horizontally cutting him in half doesn't suffice, as has been shown with Garan already.
Just going to post proof of his speed here
Although this is a 10x weaker form of him)
http://i.imgur.com/uhtzJGc.png
I have read much of FT manga and I never see Erza shown to be at superspeed from a normal person's perspective, superspeed and reactions are never even referenced as abilities of hers. Garan was fast enough to react to a near instant teleportation and jump several miles in the air so fast to make it look as if he vanished, and Garan is about half the power level that Meliodas is now. So Meliodas speed-blitzes Erza, and even if he didn't, his attack power and versatility is far too high for her to ever overcome, this is a total mismatch.
He could casually endure a nuke-level blast capable of wiping an entire city utterly off the face of the map(if it had been used) and he has endured giant explosions before, like the one used by Gloxinia on him. Unlike Erza's his physical body is definitely very resistant to blades when it doesn't come to someone close to him in power level, as can be powerscaled easily from Derierre's feat here:
https://i.ytimg.com/vi/AvVINCjdlDA/hqdefault.jpg
The sword breaks on her neck btw and the person to attack her was a decently powerful Goddess clan member, maybe 10K or so in power level, point being that yes, Meliodas is blade-resistant and Erza's weak power level would mean all of her blades bounce off. Even if he wasn't durable enough, he could coat himself in darkness for armor or just evade or deflect the blows with his sword.
Armors or no armors, Erza can't endure an attack by someone who can effortlessly split in half a mountain with a shockwave from swinging a twig, that is casually beyond the meteor or the swipe by Irene in dragon form easily. His sacred treasure effectively boosts his power level by 50%, since it grants one clone of 50% his power level which can be split into more weaker clones, allowing him a lot of ways to distract her or have them soak up damage, or just use numbers.
Meliodas can definitely fly with darkness wings, btw, which gives him another big combat advantage, this is clear from the recent chapters where all the 10 commandments(demons like meliodas although a bit lower in power) use darkness wings to fly around easily and fight midiar battles. His Hellblaze enchantment would be pretty devastating on Erza if he used it and successfully burned her body, I would imagine it'd be extremely painful although it's not like he needs it when one casual swipe from a clone of his would turn her into litte flesh bits going flying into the air.
And yes you are right to point out that Erza cannot negate durability, even if she could get rid of all of Meliodas's darkness instantly, he'd kill her in a speed blitz, and she has no chance to hit him with her sword at all.
@WilliamShadow:
Please read the evidence posted here and realize that Erza has no real chance, the meteor feat is nothing compared to Meliodas's, and it's clear that her durability is not enough to tank one casual attack by a clone of his or a powered down form.
Obviously I vote for Meliodas, low difficulty curbstomp win for him is obvious here.
