which phone should I get T-mobile sidekick 2008 or Nokia 5310 Express Music?

Nokia 5310 Express Music

http://www.cellphonehits.net/uploads/2008/05/nokia5310xpressmusic-rogerslg.jpg

http://www.unwiredview.com/wp-content/uploads/2007/08/nokia-5310-xpressmusic-official.jpg

http://www.youtube.com/watch?v=_IOu_6StjOY

T-mobile Sidekick
http://www.smape.com/userfiles/t-mobile_sidekick_2008_01.jpg

http://www.jetcityorange.com/Sidekick/T-Mobile-Sidekick.jpg