The WinCE devices are good for people who want a lot of features, video, MP3's, wireless access, etc. Palm devices are better for someone who just wants an organizer with a few games and utilities.
But yet it seems all the Palm devices want to play MP3s, video, etc... This was a good argument a few years back, but as I said earlier, it seems Palm is playing catchup to WinCE, instead of staying in their easy to use market.
One of the major disadvantages of the WinCE devices is battery life.
Not anymore. The Tungsten T does still outlast the iPaq 1910, but just by a bit (5% difference at most). Of course, the 1910 offers the ability to simply swap out the battery with a fully charged one, something I haven't seen a Palm offer yet. The 5450 iPaq also manages to pull in similar battery life results due to the larger batttery, and XScale 400 procs not taking much more power then the old StrongARM 200 chips.