There's a bunch of sarcasm coming because frankly I really wonder if people actually watch the movies or just make **** up, in which case there's not much point discussing anything.
I don't care if people refer to the comics for comparison, but if a character doesn't display an ability onscreen, well....
LOKI, definitely.
Frost Giants can probably accommodate in lower temperatures than what Pluto used to have in its days as a planet. Loki belongs to that species and he got a physique that can fight against Asgardians and endure Hulk attacks, add the kind of magic used for these stories and he's a fatal combination that can easily make Colossus metallic exoskeleton brittle and easy to break.
Yeah, remember when he used his magic to take down a much larger and stronger opponent....and froze metal with his hands ?
Nah, me neither because it never happened in any of his appearances. I'll refer to how he's used
Magic to take down bigger opponents a bit later on but, spoiler alert, he hasn't.
And that time he froze metal with his hands right ?
Yeah didn't happen either, probably would have come in real handy when he was in chains in asgard, or on earth at the end of avengers.
All he did against the Hulk was get smashed and lie there groaning. Not really much of fight there. Don't see how that's going to allow him to beat Colossus, unless Colossus feels sorry for him.
He does fight Thor in melee combat, with weapons, and later Thor admits to holding back.
So, where are you getting your ideas from that Loki can create metal shattering cold ? Since he's never done it onscreen.
There's no reason to believe Colossus is anywhere near as strong or durable as an Asgardian (which Loki clearly is). And that's without even mentioning the hundreds or thousands of things Loki could do using magic.
Piotr has no chance here.
We see Colossus fight Juggernaut and Angel Dust, hand to hand and take a pretty heavy pounding, but he can still handle a punch from either of them, and get hit with a bus. It also shows us that he also has some hand to hand skills, and will fight dirty!
And Loki's an asgardian right, clearly.....oh wait, remember how he was revealed to be a frost giant in Thor 2011 and then he actually says, to Thanos, " I'm not Asgardian. " News flash, he's a Frost giant, just a really small one.
And as for the hundreds and thousands of things he could do with magic...... like what ?
What have we actually seen him to do beat bigger opponents, or any opponents, with his magic ?
Bet that magic would have come in handy when he was stuck on Sakaar....oh wait, all he uses are his illusions.
Well what about when he used magic against Thanos in Infinity War - oh wait, just illusions and daggers, and he ended up dead.
Or when he used his magic against Kurse, oh wait, nope just illusions again, and he nearly ended up dead then too.
Or when he used his magic against Thor in Avengers, nope just his scepter and daggers and he got press slammed.
Or when he used his magic against Dr Strange...
nope, again just the daggers.
What about Hela ? Nope again with the daggers, yeah, didn't go so well for him.
So gosh, it looks like he's the only magic we've seen him use are his illusions and daggers and that's it.
Maybe Loki can shank Colossus with a magic dagger and kill him, but please let's not just make **** up about what he can and can't do. If he doesn't display an ability onscreen then it's pretty questionable to make arguments around it.
Anyway, I just finished watching the Loki show and he was a joke and a complete punk ***** for most of it - if Colossus is willing to shove a live electric cable up Juggernaut's bum, he's probably capable of curb stomping Loki's midget Frost giant ass.
I'll say Loki 6/10 with a sneak shank attack and the other 4/10 times getting grabbed by Colossus and pile driven into the ground or punched in the balls !
I apologize for the sarcasm.