The vast majority of games on Xbox live are Peer-to-peer connection games. As far as I know, Xbox 360 doesn't really have any games that use dedicated servers hostedby Microsoft.The only exception I can think of is NHL10 EASHL games, which are hosted on dedicated servers run by EA Sports. Lag online for peer to peer connection games has nothing to do with Xbox Live, but is dependant on the internet connection of whoever is hosting the game.
So unless you are comparing dedicated servers, you really can't say XBL is more lag-free.
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