Vision vs Guardians of the Galaxy:
Okay, so. Civil War did establish that, yes, sufficiently good tech can temporarily inconvenience the Vision. If Hawkeye has it, than surely some of the Guardians can pull out something similar. The problem is. . . well, "temporarily inconvenience" is *all* that it did. The question then becomes, can the Guardians actually follow up on that in any way that can actually incapacitate the Vision? Options that come to mind-
1. Brute force: The Guardians have a lot of it, but the Vision is both a vibranium brick and intangible. I don't see any combination of blasters, blades, and fists from the Guardians being able to do much here, especially since most of them probably can't even hit him while intangible.
2. Rocket Raccoon's mad science: Rocket can build moon-busting weaponry and all kinds of weird tech, I can totally buy him building something that could take out the Vision if he were given the time and opportunity to prepare beforehand. However, I'm dubious of him doing so with just the random stuff he's currently carrying at the moment. At least, not without requiring both an advantageous arena ( "fight takes place on a space ship" ) and an openness to pyrrhic victory ( "Rocket mad science detonates the entire ship with everyone onboard" )
3. Mantis' mind control: Its really really frickin' powerful, and normally all they need against most opponents is an opening for her to shut them down. The problem is, the Vision ( for this fight at least ) has the Mind Stone on his forehead. He may be fairly crappy at actually using the Stone, but I'm really dubious that using a telepathic attack against someone who is currently jacked into the Mind Stone is a good idea in the slightest.
So, basically? The Guardians are more skilled than the Vision certainly, and more numerous, but Vision just has an unfortunate combo of powers and, well, power, that mean I don't see them winning a fight. They just aren't going to be able to hurt him, only delay him. Vision takes it.