I can imagine synchronisation with Outlook being better with WM - and I think it's simply because I don't need those features much (and I have a Mac at home anyway), that I like the Touch much more.

Touch!
Also, I seemed to never be able to find a setting where my PDA responded with any kind of speed when I wanted to start up, or use an application

It lagged constantly, 30-60 seconds most often - even at full 520 mHz. The Touch /iPhone interface just works, now, and not in a minute