The answer to this should obviously depend on the chosen set of test websites. But even if there are websites where the AMP version would be preferred (and I'

The answer to this should obviously depend on the chosen set of test websites. But even if there are websites where the AMP version would be preferred (and I'm sure there are), that's not the whole story. In order for a user to make an informed decision about their preference, they have to take into account the whole cost -- not just the immediately observable part of it. That includes all future ramifications of an AMP-centric future, many of which would definitely not be good for the user. So while I'm sure there are examples of egregiously bloated websites that would be superficially improved by AMP, I'm not convinced the user comes out with a net benefit.