I'll ditto MN on this one. You probably don't need to worry about this until you're about to head out on your rotations.
I will, however, put myself on the record as saying PocketPC sucks. It's slow, it often crashes, has a more complicated interface than Palm, and lacks the availability of medical software (especially freeware) that's available for Palms. Starting up Mobile Micromedex on my PocketPC takes waay too long (maneuvering the "Start Menu", plus the time it takes to load). I remember on my old Palm Vx, I would just tap on the icon, and it loaded quickly. My Dell Axim is a brick, I hardly carry it around. What good is a PocketPC if you can't carry it around in your lab coat POCKET! Not much. I truly envy my classmate's Palm Tungsten T3.
If you must get a PocketPC, the only reason to do so would be the integrated wifi available in some models. I think some Palms might just have integrated Bluetooth requiring you to have a compatible Bluetooth cellphone to connect wirelessly to the internet. AFAIK, that's the only downside to Palms. And even so, you can probably get an 802.11b wifi SDIO card for it, so it's almost a non-issue.