I read so many reviews, my head spun! You have to be familiar with Palm vs Microsoft (there are others, Symbian for example) - having had both, I would not go back to Microsoft. There are a wider variety of applications per category for Palm, and in the end, it is the applications you use that will likely determine which PDA you go for.
I use the Treo 700p - Sprint. I did use the Windows version 700w and found the applications cumbersome in comparison with the Palm versions.
I also used the Motorola Q from Verizon - no problem with Verizon, but the phone is awful - using it for phone and broadband modem requires constantly changing a setting in the phones setup.... by comparison the Treo 700p is a joy - plug the phone into my laptop, and go to the net, QUICKLY.
Spend some time in the stores, read reviews and short-list your software. HTH