Comparaison between the different offer on the market : XBLA, PSN and Wii-Ware.
http://www.eurogamer.net/article.php?article_id=254437&page=1
"I would argue that the 360 currently has the advantage in four of the areas discussed, with the PS3 edging it out in terms of the overall shopping experience, as well as having a much better quality-to-crap ratio. The Wii Shop, on the other hand, is over-priced and horrible to navigate, but does let you buy The Legend of Zelda, Super Mario Bros 3 and Metroid for just over a tenner"
I suppose the november dashboard update will give the definitive advantage to XBLA...
Evan Wells (Uncharted 2): I think the differences that you see between any two games has much more to do with the developer than whether it’s on the Xbox or PS3.