wma is just another format (microsofts) like aac is apples. Not much different in any of these formats, playlist is i assume the same as saved from media player.
I like the tuner bit but not the batteries

May aswell get a rechargable model (i get 8-10 hours) save messing about all the time, i don't understand the hard drive comment though, i thought all of these stored music on hard drives (which won't be affected by being thrown down the stairs let alone in the gym).
Ipod has the greatest range of accessories at the moment but i do wish they would put a tuner on em!