The PlayStation 3 version of Treyarch‘s Call of Duty 3 was first released on 17th November 2006 in North America; in PAL regions on 23rd March 2007, and in Japan in 14th June 2007. It is an enhanced port of the PlayStation 2 original, with more detail in the models and environments.
Gameplay-wise, this is more or less identical to the original. Same missions, structure, dialogue, objectives and length. 14 missions, covering American, British, Canadian and Polish campaigns.
If I were to play only one Call of Duty 3 now, I would choose a PC version over a console version, but since a PC version of this game doesn’t exist, I’d have to choose the PS3 version instead. The PS2 original is good, but the PS3 version slightly edges it in terms of atmospherics and detail. As you’d expect, really.