I have felt many "significantly worse" on very, crappy systems. I feel there is a vast number which are similarly "premium" or very close, I can't tell the diff

I have felt many "significantly worse" on very, crappy systems. I feel there is a vast number which are similarly "premium" or very close, I can't tell the difference. Are we sure that there is significant differences or is this just the Apple Halo effect in action ?