If you are using 1080p/24, there will be very little difference if any. When you start using other resolutions, that is where the chip really starts kicking in. Some say the resolution is soft at 720p on the PS3, but great at 1080p/24. Others say it is fine at 720.
My personal preference is for stand alone players. It's one of those things where you'll have to see what looks best to you.
All things being equal in PQ... other things to consider (besides gaming) is an HDD that can store music, video, photos, etc.; stream media from your PC network; download content/media from Internet... You can even use it to rip CDs and export them to an MP3 player. Biggest drawback, no bitstreaming of HD audio formats.
I have two PS3s and a Samsung BDP-1400. One PS3 aqnd the Samsung are connected to 1080P sets and it is difficult to tell the difference. The other PS3 is connected to a 720P LCD and is slightly softer, but can also be the TV. I like the PS3 due to the fact that it is upgradedable (including new features) thru firmware. It is 2.0 and it plays DTS HD Master which not even the new 1500 has yet.(will be upgraded thru firmware at some point).
I saw some softness at 720p, but never got to use it at 1080p. Its a great unit because of all the other things it can do. I sold it because I only had a 720p at the time and was not happy with the softer pq.