In my area, t-mobile has terrible coverage. Google really limited their customer base by going exclusively with t-mobile. I hope at&t or verizon have an android device soon. I'd love to get one but it doesn't have applications I use. I think I'm stuck with WinMo for a while. I hope v6.5 and v7 are good
For me it's about funcationality and applications and the G1 and iPhone can't compare. I know the iPhone has a zillion apps but they're just that, small applets. Even some counterparts to winmo apps I have are made to work off the network connection instead of local data and that doesn't work for me. I need full applications.
If I was going to change platforms, I'm much rather go to a G1 than an iPhone but that's personal preference I know. I don't like a lot of things that apple does. For example, making mp3 players with no screen is a disservice to humanity.