My male Grey is not as aggressive as my male Amazon, no. My male Amazon is DANGEROUS when he is hormonal. My male Grey is merely a bit more aggressive and at the same time loving, depending on his mood at the time. All birds are individuals of course, so yours may be totally different, but on the whole, I find Greys to be much easier to deal with during breeding season than Amazons..or at least the ones I have, I should say.