Originally Posted by RPG2002
IMO the PS3 60GB NTSC/US is the best because it has PS2 backward compatibility by hardware (same as the PS3 20GB), but they are discontinued. The PS3 60GB PAL and all the 80GB models use emulation (that means that some PS2 games have issues). The "40GB" models (PAL or NTSC) do not play PS2 games.
If you will use PS3 games only, both models are ok. The major difference is in PSX, PS2 and DVD movies that are region locked. So it depends what is your region... and what is the region of the media available in your stores.