the usual reply is to recommend them to buy what ever the majority of there friends use. but that's just a cop out as they are asking you, so.....

it plays 3D movies and Blu-ray, has a big enough catalogue of games to keep anyone happy and multi-player is free.

is there really any reason at all to not recommend the PS3. i can only think of one and that's just my choice of preferring 360 pad over PS3's.