iamnotback's posts are so extensive and detailed that i have no idea where he'd find the time to post the hateful junk that roach does. or to what purpose.
R0ach just seems to have some weird hatred for Bitcoin. He thinks that the value of decentralisation is zero. I have no idea what he has to gain from posting loads of FUD on a Bitcoin forum when most of his arguments are against cryptocurrency in general.
iamnotback tends to at least post things that are pretty meaningful and often clever, even if they're occasionally hyperbolic.