If you have the budget of PS3 go for it, over and above your BD player it will have
1. Gaming
2. Keyboard / mouse support through USB so that you can surf net through PS3 on your tv and view any website that is supported by that browser including Youtube, etc
3. Wireless streaming
4. Internal HDD for copying photos, music from network etc
5. Built in video creator and uploader (if you have PS3 eye camera and this comes iwth Move pack if you are not purchasing separately)
Equals between both
1. BD / DVD Playback
2. Network streaming (wireless / wired)
Negatives of PS3
1. Region lock, some BDP can be Region Free or can be tweaked
2. Wifi is G based and hence streaming capability is poor for Large Videos if you have a router placed far away from PS3 and DLNA / UPnP is must for streaming, normal file sharing over network is not accessible unless the media share software is running in that machine. Of course suich network playback capability is not avaialble in many BDPs.
3. Games are costly but then again you can rent or exchange, but then again the gaming capability is not there in BDPs altogether
4. USB Playback formats may be higher in number for some BDPs
5. VCD movies are not playable.
6. You will need to purchase remote separately unless if you manage through controller as that is also possible and many do that.