The point is it's not a contest, and we should be opposed to it no matter which country is doing it.

They're both guilty of imperialism on a world wide scale and all the evils that includes, but aside from it's early days the US has generally been a better neighbour by pointing their evil overseas, Russia has largely been a menace to it's neighbours in every era of history. I would say that's the biggest difference.

I'll keep saying this:

One side is a hyper-financialized economy of almost only consumers, which sits at the endpoint of the most global supply chains, devouring on a scale that is devastating the planet, pushing the environmental and human cost of that production on the global south, and who basically only export loans, monopoly priced essential goods, and IPs back to the rest of the world, that feeds their surplus production into an enormous military industrial complex that they use to force this global extraction system on the rest of the world.

While the other "side", we'll start with Russia, is an impoverished hellhole place to live in that has been economically gutted, and now has been fighting a war against Ukraine that has been going on for over 12 years, a war that is being used to throw the entire military might of NATO member states against, not to liberate Ukraine, but to try to use the opportunity to fight a proxy war directly against Russia, and the real goal is to bleed out Russia so it submits again to other side and they can put in a new dictator in charge that they can actually control this time. (I, for one, remember the time when Putin was their neoliberal darling.) Supporting Russia is a bit like supporting Saddam, you shouldn't support Saddam, the Ba'athists were morally corrosive (maybe too unfairly bad for this analogy, actually), but you definitely shouldn't support the US military and their allied countries in the Iraq war. (Like if you want to support the people of Ukraine, do it in a way that doesn't feed into the war, like hunger relief, or humanitarian aid.)

And China hasn't been at war with any other country since the Korean war. I guess China just kinda sits there, menacingly, as they build their productive capacity. And they're against Taiwan (which literally calls itself the "Republic of China" btw), but I don't think they do anything at all other than negotiate and respond in kind when the US moves more ships and drones there. Then there's the Uyghur stuff and the Tibet stuff, which I know there is probably a kernel of truth to, but I think that's up to people in China to deal with, and definitely won't be solved by like the US sending aid there, because again, when the imperial core does these things it isn't actually about the people, it's about exploiting the problems countries those countries have in order to tear them apart.

Keep coping.