Before getting caught up in comparisons, what are your needs...
Address book, diary, and contacts?
Then go for the more basic option (just as long as it links to a PC, otherwise you've no backup like with those free "digital oganisers")
My situation...
I use an iPAQ provided by work, as such it's probably the best option, sync from microsoft to microsoft products has to be the best it can be.
But if it was my own personal buy, and as my personal needs sound similar, I'm guessing that I'd go for a basic palm, what makes the difference? it meets my needs (what no computer salesman likes to hear), at a cheaper cost,at a smaller size and much better battery life.
Cheers