well that really depends on what you define as the "same side". atari=atari and amiga=amiga, i don't care about the amiga in its present form to be honest. not saying it's a bad machine, just don't like it and never found a better use for mine than watching demos and playing games.
what is good about atari software depends on what you expect from it... reliable and uncomplicated are the key words. ofcourse it was nice that amiga had real multitasking from the beginning- but was it really useful on a 512k machine?