PS3 has the best track record? More like the worst. The XBox 360 has the best track record here. There has never been a widespread software exploit of the 360, and MS are very quick to hand out perma-bans to anyone using hardware exploits while connected to XBox Live.
Yes the PS3 has been busted wide and you can install and play games from the HDD instead of the BDROM. What you can't do is get access to PSN. Sony has been putting system updates into new and upcoming games and the crackers have updated their custom firmwares to do the same.