I currently use 3 phones on a daily basis, a Pre2 (0n 2.0.1), HTC desire with Gingerbread 2.3 Oxygen rom on it and an Apple Iphone 3G (IOS 4.2.1)
Flipping Sims throughout the different models and depending on my mood I'll use one phoen more than another etc.
Interestingly it's my Pre2 that sees the most use, intuitive, quick, easy to look up stuff, the screen is truly readable in full direct sunlight, which the HTC (amoled) is terrible at, the Iphone 3G in sunlight is not usable other than on max brightness.
you can type on the Pre2 while in movement (car, train, metro etc.) touch screens are a pain to type on when your body is in motion. Speaker phone of the Pre is the better of the 3, reception is simliar on all.
Bluetooth integration of the Pre 2 is by far the best, for example in my Audi (3GMMI system) the Pre2 when connected shows a different icon in the address book of my Audi to differentiate between a mobile or landline number, it also loads the address book significantly quicker that the other 2 when connecting.
I like the size of the Palm, much easier to pocket in a pair of jeans in the weekend than either of the other 2 and it's surface is anti slip, so it does not slide around in your pocket.
The touch feel of the Pre 2's screen is better than the Iphone 3G, HTC's touch screen is not as nice feeling.
Android while allowing you to customize just about anything, you get lost in the menus and options, they all look alike and you hadly ever find a setting where you expect it. WebOS is much more structured it's easy to find the settings you need, plus with Preware you can patch up little items here and there.
Overall I keep returning to the Pre2 over and over again. 2.0.1 still has some bugs, a big one is the POP3 accounts not retrieving text and attachments, but I circumvented that by using IMAP settings instead.
I've owned an original Pre, now on 1.4.5 with a lot of patches and overclocked, the Pre 2 is definitely in a league above. My wife is now using the Original Pre, she declined the Iphone 3G as being too slow and the HTC Desire as being to difficult for her daily needs.
Battery life, the HTC is terrible, (I got better battery life on my original Palm Pre) I barely get through the day, the Iphone 3G has the best battery life, with the Pre 2 close behind.