I found this when I was considering which version to buy:
http://www.reviewlagoon.com/viewarticle.php?articleID=5
"For $20, the retail version seems like a better buy - the moves guide alone is worth a few bucks for those that want to master the game without the "hit and miss" nature of regular play. However, without ANY other improvement to the game other than that (sorry, not counting the WATCH MODE), and the grossly compressed video which wasn't necessary in a cartridge version, I have a lot of reservations in the $20 price tag."