i like my desire, im not 100% in love with it yet but i would say over my 3 previous iphones its certainly a nice phone.
so my reasoning, iphone at the moment has the folliwng going for it a smoother os experience and apps . but it is seriously restrictive.
i love how open andriod is, the desire itself is superfast and widgets are something special as is the live wallpapers (which would probably come to iphone in about 2015),sat nav, the andriod store is getting there, but then the apple store was crap once (and some would say still is) so im more then happy to wait until more people get on board (google expects a massive surge of apps this year)
the desire is a nice bit of tech and it may take some getting used to but it is worth it.
andriod 2.2 is really going to up the game a lot with wifi hotspot, sd card install apps/games (meaning bigger and better games/apps), refreshed marketplace (to make it more like apples experience), itunes streaming, music downloads and a big speed increase;
i sync all my music by itunes and an app called itunessync, so you dont even have to lose itunes either.