I got the Sansa a few weeks ago and I must say I am VERY happy with it. After having many problems with my iPod Mini, I will never buy an iPod ever again.
My only complaint about the sansa is how hard it is to get playlists on it. You have to use a program like Windows Media Player to sync a playlist onto the player, or use the on-the-go playlist maker (which is more clunky than the iPods on-the-go playlist maker because you have to do each song individually instead of a whole album at a time).
The player does play MP3s, just drag and drop them on. No iTunes type program required (which I like, I hate having to use a program, I like doing things manually). And I don't know if there is another option, but with the media converter the player comes with it is VERY easy to get pictures and videos on to the player. The converter changes any file type (well, that i have tried) to a .mov and puts it directly onto the player. Very simple.
All in all I love the sansa. I didn't do much research into the creative before I bough the sansa because I wanted the 6GB and the option to add extra memory in the future.