The Pocketbook 360 is the best 5" device, I agree with you,
No, the opus is the best 5"
More seriously, "best" is a notion there the depends on your own needs and tastes.
You like the 360 better, I like the opus better. The opus have a better rendering with ePub, that's why Me myself and I prefer it. Even though the 360 have goods ergonomics, multiple level TOC support, and other stuff the opus don't have. But because I think that way don't mean everyone will, you're a proof of it.