Hmm... So we're going full powered, unrestrained Goku? Well, let us get into it... Okay, so Goku's Super Saiyan God form in Super ended up showing us a lot of things about what it can be capable of, as well as its ability with God Ki, so let's start off. Here's just a reminder, for those who think Goku isn't that fast, Raditz combat speed was around the speed of light, and Raditz isn't even worthy enough to be a tick in unrestrained Goku's hair. Just keep that in mind.
Goku, as a Super Saiyan God alone with no training has multiple feats, such as his new strength. Him being boosted up to where three of his punches could send the entire universe into darkness. He'd have to hit something that could withstand the blow without becoming splattered pudding, and reading the opponent's stats, I could see he could take a hit. And in the God Form, Goku can breathe in space... But not underwater... Feel free to make your own theories about that. Also to be mentioned is how the God Ki works, there are still many mysteries about it, but here's what we do know. First off, its heightened defense against non-God Ki users, making it basically so whatever damage does get through, the damage is a lot less pain inducing than if another God-Ki user were to use it. Second off, Regenerationn/immortality. Pesky gods, always showing their aura off like it's some rave, so he won't really feel my punch, so what? Well I'll tell you so what, because combined with it is temporary immortality and of course Regenerationn, in the God Form, Goku cannot be killed by a non-God Ki user. (Forget the Revival of F movie where he got show with the lazer, they retconned that part in Super so he was in his base form instead of God Form.) However, if he is worn down, or the being has abilities purposefully made to knock God Ki away from temporary gods, such as Hit. The Regenerationn will only kick in when he's in a death-like state. This ki is an unsensable kind unless you have God Ki yourself, with the combination of learning how to sense it. The God Ki can also be used to power up your attacks, putting them far higher than what they'd normally be, when the attacks are 100% infused, they can go though any other energy attack not infused with the God Ki as well. And a cool little trick God Ki does have is it can be used almost as if it were alive itself, this is evident in Goku and Beerus's battle when Goku create a large red dragon made out of ki, it can either be used for combat, or to help increase your power, or both. This form has an extreme amount of power, so why don't we move on with the Saga's? Onto Revival of F saga!
After a few years of training with Whis, Goku's base form is now referred to as the Saiyan Beyond god form. Why? It's strength is the same as the Saiyan God strength was when he first transformed. So that three punches universe thing, yeah, now it's apart of his base form. But that's not what important, what's important are the newly discovered forms. First, we'll start with the Super Saiyan Beyond god form, which is basically going Super Saiyan. Everything is now 50x from what it was before. Yay, extreme power boost. But... Let's go even further beyond. Goku has mastered the god form at this point, so... Just for the hell of it, he combines it with his Super Saiyan form, creating the Super Saiyan God Super Saiyan, easily referred to as the Super Saiyan Blue. It retains all the god abilities from before, and because Goku has much better control of the power, he can condense his attacks so that they don't destroy everything, but the opponent will feel the full force. So, with all this, just how strong is this form? We have no clue. Turning into a normal Super Saiyan is 50x the old God Form, and turning Super Saiyan Blue makes him powerful enough to knock out that Super Saiyan in one punch, so... Go do what you want with that.
And now for the most powerful of Goku. So remember everything from the Revival of F saga? Okay, now times it by 1.5 and that's what he is now. Plus his God Form keeps all the abilities. So he's a bit stronger, so what's really different? What's different is after seeing the Earth destroyed in front of him because it was his fault, he decided whenever he can finish an opponent or exploit their weakness, he'll take it. Especially if it's a fight he think he can't win, or a fight to the death. This is shown in his fight with Botama, his reaction to Vegeta's fight with Magetta, and his fight with Hit. Any opportunity he'll get to win, he'll take. However... There's an exception, like the Universe 6 ending, but those rules don't apply in this kind of fight. Okay, so Goku got a bit stronger, what's so new about that? Well, Goku has a new/old technique. The Super Saiyan Blue Kaioken. The Blue form has much better ki control, and because of that, there are new rules to it, Goku can raise the Kaioken as high as he wants, honestly as high as he wants. However, he has a 10% chance of dying trying to reach whatever level he wants, but he does get a few seconds to check if it's yay or nay. So if it seems like it'll fail, he could just cancel it out and try again. And the other consequence is you have a time limit of being in that Kaioken stage for about 15 minutes, when it runs out, you've pretty much loss. In a Kaioken X10, his traveling speed was fast enough to break through time itself, becoming faster than his own Instant Transmission, that's not even looking at combat speed, which is always significantly faster.
Items: He'll get to have his power pole, the magical item of which can grow however long Goku needs, and he'll have three senzu beans. May be an idiot, but comes prepared to a fight to the death.
Prepare time? If there is, Goku indeed got the weaknesses from the Kai's and will only use them if he feels like he can't win.
Techniques: All past techniques used in the Anime and Manga except Spirit Bomb.
Well, I got all this, so who do I think will win? Well, I'll side by Goku, but that's just me. In the end, it's your guy's decision who you stand by.
