I'm deciding between iRiver Clix and Sansa. Sansa is probably the better deal, but which one has better sound quality?

I'm also considering Creative's M Vision instead of the Gigabeat. Do Creative and Toshiba have roughly the same sound quality? Is they do, then I'll probably go with the Gigabeat since I'm been hearing good things about its interface....if I go the way of hard-drive based, of course.