have both and if you ask me, i would say stay with Ps3
here is my experience, see if it is any good to you.and i will try to cover all your questions ( if i were you, i would read it carefully )
First i bought my xbox 360. When i went to buy games i was like wow...hmm... i looked for somewhere where i can buy decent and new games but pay less... what i did and i would like share it with you is on eBay. No matter if you are a ebay person or not but on ebay you can get all the games for half the price. ( i know you cannot trust all the sellers but after buying about 30 games, i have a list of trusty sellers on ebay and if you want i can give it to you ).
I was enjoying my xBox 360 until it died after 3-4 months ( google' xbox 360 problems' for more info ).. i had to send it to microsoft and it took 3 weeks and i got it fixed. I was happy..it took 5-6 weeks and it died again...again i did the same thing and got it back...i was upset anyways.. it took about 7-8 weeks and it broke again...again i did the same thing and got it fixed and back .. i was mad. ( then i found out 33% xbox 360 owners had been gone through the same trouble with their consoles ).
After that i was really afraid to even touch it... you know what i mean.. i wanted to have fun with it but i knew everytime i turn it on could simply be the last time it goes on.
So step by step it came to my mind to get a PS3 .. logically i did some research to find out if PS3 is also going to let me down but i was suprised because i could not find any. More i did read about Ps3 more confident i became about it....well, i saved money and eventually i bought a Ps3.
Since i got my Ps3 i had no single problem with it. It has always been there for me .. and just to let you know, since i got my Ps3 i have not bought any more game for my xBox 360 and the most amazing part is that Ps3 online gaming is free. for example could of weeks ago when i was deciding to get a Call of Duty 4 i was not sure to get it for xBox360 or Ps3 , but when i remembered my experience with xbox 360 and compared it with Ps3 i darted for Ps3 version. Besides i asked myself why i should i buy the xbox 360 and lay something extra out for playing it online when i can play it online for free with Ps3. I got it and i am loving it.
And the same story went for Assissins Creed and i got it for Ps3 although xbox360 version of it was even some bucks cheaper but as i explained xbox 360 can die every time you turn it on/off.
If i were you i would go for PS3. ) 95% of current games are on both consoles but in couple of months there will be some freaking good games exclusively for Ps3 .
Well, xbox 360 has still my respect but Ps3 is honestly a better console.
One more thing, you may think about spending some extra cash on Ps3 but trust me, Ps3 is even cheaper. With Ps3 you can surf internet and play online Wireless but for xbox360 wireless you have buy somthing extra. xBox360 online is not free and is not cheap but Ps3 is free.
I like my xox 360 but i love my Ps3.
( if you think i can answer any other question you may have regarding this, feel free to aks )