Best Amiga games company?
This is a hard choice..
Cinemaware was a fantastic one.. They put so much detail in their games. Think of Wings.
Psygnosis: They taught the world what Amiga was capable of doing with their innovative graphics and multiple scrolling levels. Think of Shadow of the Beast
Team 17: Quantity and quality. Think of Worms.
Anco: Kick Off 2! The best two player game in the history of mankind since Adam shagged Eve.
And many more that I can't remember at the moment (Microprose?).
However, my vote goes to LucasArts, not only they created the best adventures but unlike Sierra they pushed the Amiga to its limit instead of caring for the PC versions only and producing ugly and slow titles. (Space Quest 4, ick)