just got my desire 3 days ago.. now have both desire and nexus one in a pocket. i feel like an android freak.. huhu

well honestly it's hard to say so. in terms of design i prefer nexus one a lot. i just for the time being prefer the desire because of it's Sense UI. While my Nexus also has Sense UI a21 rom on it, the waiting period for a better version somehow is too long.. dont get me wrong, i know the devs are doing their best on it, but i just cant wait anymore haha..
nexus one is same like desire without the Sense UI. if u dont mind about the sense UI, i think u only have to ask urself which design u prefer the most. nexus or desire.

if for u is the same, i can recommend the nexus due to it is the Google phone, meaning it will be the 1st to have the latest update..

milestone is great, my dad is using it. .while legend also a good phone despite it's lower spec than nexus / desire.

but i wonder why u have nexus in one pocket and milestone & legend in the other pocket.. it's weird becoz milestone is the biggest phone compared to the other two and if i were u, i surely put the nexus one n legend in the other pocket..