The common points 360 users make is that the 360 has better online, more and better games, Kinect, sales, and some other stuff I forgot.
Point 1-Online. LIVE really isn't any better. Cross-game voice chat would be nice to have, but nothing big. Multiplatform games may do marginally better with LIVE than PSN, but PS3 exclusives do far better (Halo 3 was unplayable on a friend's satellite connection, but KZ2 worked decently well). The big issue is timed-exclusive tat. Timed exclusive CoD maps, games, or DLC. Brag about it while you can, but once the timer runs out you can't say anything at all. Pointless waste of MS's money I'd say, but whatever helps them feel better. 1 thing I have to say though, my friend Mike's (4th,due to repeated breaking) 360 doesn't like his ethernet cable (which works fine with the PS3) and won't connect to LIVE. Just throwing that out there.
Point 2- Games. No it doesn't have better games. The 360 exclusive line-up had a strong start when the PS2 was still out, but now that the PS3 got its shoes tied the list is very very poor. 2011 has Gears 3 (which I heard is already finished and has been for months), Forza 4, and that is about it. Comparing to the PS3 which has Resistance 3 and the new Motorstorm, to name just 2 of at least 10 big name games, it is very poor list. Back catalog is more comparable, but the PS3 has more AAA titles and more big name IP's (Gears, Halo, and Forza vs inFamous, Uncharted, SOCOM, Gran Turismo, God of War, R&C, etc.). 360 has the quantity (a good chunk of early titles were also on PS2), but PS3 has more quality.
Point 3-Kinect is not going to be useful to core gamers. Lag and imprecision are very detrimental to its potential. The fact that there are no buttons is very very crippling. If you can figure out a way to play Halo Reach competitively with it online, and maybe I might reconsider my stance. The Move however is different. It has buttons and precision. MAG players with Move are doing quite well. Kinect is more family friendly, but family friendly shovelware is all you will get. It could have some cool non-gaming functions, but nothing the Move can't do more accuratly and with better reaction time.
Point 4- Sales. 1 year head start is helpful, but remember how earlier I mentioned my friend Mike is on his 4th 360? Probably not but he is on his 4th 360. He had them sent it and got a new one at no charge which is great, but here comes the kicker. My friend Darren is on his 5th or 6th 360, and when his go down he buys a new one. That is 5 or 6 sales on 1 person. I am very certain he isn't the only one. Me friend Jake works at Wal*Mart and says he has heard some idiots skip out on the warranty and opt to just buy another one when it breaks. The point I am making is that at least 15-40% or 360 sales are repeat buyers getting new ones due to their old ones breaking. Anyone ever compare number of 360's in use vs number of PS3's in use? I am very certain that would be in the PS3's favor (can't be bothered to look).
TL
R-
-Timed exclusives aren't worth the cost of LIVE and PS3 exclusives run far better than 360 ones.
-Quality vs Quantity, the 360 may have more, but the PS3 has more good games
-Kinect is a kids toy and I will not say otherwise, you can't play Halo online and do near as good as someone with a controller
-People buying a new 360 4 or 5 times due to hardware failures really boosts sales figures.