I think the ability to download full-size games on the PS3 (like Siren, Warhawk, Socom, Burnout, GT5: Prologue, etc) is a big advantage.
Both XBLA and the PSN have great downloadable titles, but the quality on the PSN is somewhat higher. XBLA wins in quantity.
The cost is a big advantage for the PS3.
PSN is generally more reliable in multiplayer games and has more dedicated servers rather than player-hosted games.
XBL wins in terms of the coverage of some of the features, such as looking at the specifics of what other players are doing, but the PSN has made major strides recently that have made the gap negligible when it used to be sizeable.
XBL has a better video library, but the gap is closing.
XBLA does have fully downloadable Xbox titles, which is hella cool. PSN does have PS1 titles, but until PS2 titles are available XBLA will have the advantage here.
The PS store's interface is slightly better, IMO, but this is preference more than anything.
The point system is kind of unnecessary on XBLA, IMO. I like how the PSN just uses dollars.
We'll see how much of a difference Home makes.
We had two bags of grass, seventy-five pellets of mescaline, five sheets of high-powered blotter acid, a salt shaker half full of cocaine, a whole galaxy of multi-colored uppers, downers, screamers, laughers…Also a quart of tequila, a quart of rum, a case of beer, a pint of raw ether and two dozen amyls. The only thing that really worried me was the ether. There is nothing in the world more helpless and irresponsible and depraved than a man in the depths of an ether binge. –Raoul Duke
It is hard to shed anything but crocodile tears over White House speechwriter Patrick Buchanan's tragic analysis of the Nixon debacle. "It's like Sisyphus," he said. "We rolled the rock all the way up the mountain...and it rolled right back down on us...." Neither Sisyphus nor the commander of the Light Brigade nor Pat Buchanan had the time or any real inclination to question what they were doing...a martyr, to the bitter end, to a "flawed" cause and a narrow, atavistic concept of conservative politics that has done more damage to itself and the country in less than six years than its liberal enemies could have done in two or three decades. -Hunter S. Thompson