They're both good drugs.
2C-I is a typical psychedelic, that is particularly visual (moreso for some than others), which is somewhat stimulating, but with very little mind-fuck, to the point where some criticize it for being shallow. It's great stuff for social situations, maybe for party/club/rave type setting, but not much for introspection.
aMT is an empathogen/psychedelic. I havn't pushed the dose high enough to say much about the effects beyond that, but it's a very different sort of drug. It's also really long-lasting and slow to come up, while 2C-x's are pretty short.