Which platform for best MP - SP?

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Just a few of us SIM players on Xbox on a regular basis and wondered how the other platforms are doing in terms of MP community and for SP enjoyment.

The choices are 1l-1946 or WOP on a PC or get a cheap used 40Gb PS3. Either way I have to spend but don't mind if its worth it.

IF anyone can comment on the merits or negatives of the above from experience then let me know. I read that PC WOP and PS3 owners are having problems finding regular games (simulator) which begs the question is IL 1946 still the best option for MP and SP when things are quiet on Xbox? How many have the PC sims and which one do they recommend for MP. I woulldn't mind an occaisional game on PS3 and get to meet some of the PS3 regulars on this forum but if the PS3 community has also dwindled then not a lot of point. I will stay with the Xbox because of the friends I have made but it would be nice to try another platform occaisionally. But which do I get...?