I never used any other early 8-bit computer than the Commodore 64.
It was a very long time ago, so I don't remember too much, but I remember that I very much disliked the Atari 520 STE in comparison to the C=64's.
The feel is largely linear, but very mushy at the bottom. The key caps were quite wide on the top, so I mistyped a lot.
The function keys were the worst, though: they were flat, flush with the top of the case and rhombus-shaped to go with the diagonal design theme of the case. You mistyped these even more.