I don't have the top 50 list in front of me so I'm just guessing at this but:  I don't think it's as clear cut as this makes it look.  I'm sure that if you look at the games available on both consoles, there's a pretty good chance that the 360 counterparts outsold their PS3 counterparts.  Games like Alan Wake, Viva Pinata, Final Fantasy, Street Fighter, Bayonetta, and such did very well on the 360.  It's just that the 360 had so many games in the shooter genre that end up doing sooo much better (again, multiple entries in the Halo and Gears series--both very good series) tend to crowd out other games and genres.

You're right in part. Most counterparts sold better on X360 and it's just that shooters (and WRPG's to some extent) sell gazillions on the platform.

But some genres are not even represented in X360 top 50 like stealth, fighters, interactive drama, JRPG, Hack n' Slash. These sell worse (sometimes much worse or are just inexistent) on X360.

Anyway, obviously that's no excuse for Mass Effect selling poorly on PS3. Although PS3 owners are not very keen on WRPG's, it's mostly due to the fact that the series is incomplete on PS3, that it came too late and that it's available on PC.

Haha, it's ok, I understand.

There are plenty of diverse gamers on the XBOX 360, just sadly not enough to stop shooters completely dominating. It isn't so much the XBOX 360 vs PS3 sales of one game, there are too many factors that effect that such as people's preference to buy multiplats on the XBOX 360 and the install base at the time of the games release. The problem is, as you said, "there's not much room for anything else" in the top 10.

Don't look at it as if I'm saying "there aren't enough diverse gamers on the XBOX 360", I'm saying "there are too many shooter fans on the XBOX 360".

I'm hoping that it's just because, like Bioshock and a few others, it's just because Mass Effect 2 was released a year later on the PS3 and the first chapter of the series isn't available for PS3 fans to fall in love with (Pretty much, exactly what you said.).  I think I play a pretty wide variety of games (I'll play pretty much anything if it's good) and I have a lot of respect for the Mass Effect series.  I hope that ME3 is embraced by everybody on both consoles when it releases.  I think it's a really high quality series.

they are still all nerds...

360 adventure = 18.75 million
PS3 adventure = 15.40 million
360 : Ps3 ratio = 1.2

360 action games sales : 88.69 million
PS3 action games sales : 99.39 million
Ps3 : 360 = 1.12

360 fps games sales : 125.35 million
PS3 fps games sales : 72.77 million (less than action games)
360 : Ps3 = 1.722

360 shooter sales : 29.67 million
PS3 shooter sales : 15.50 million
360 : Ps3 = 1.91

360 RPG sales : 40.29 million
PS3 RPG sales : 25.13 million
360 : Ps3 = 1.6

360 platform sales : 9.24 million
PS3 platform sales : 15.54 million
PS3 : 360 = 1.68

360 racer sales : 43.90 million
PS3 racer sales : 42.64 million
360 : Ps3 =1.02

360 sports : 75.25 million
PS3 sports : 64.99 million
360 : Ps3 = 1.15

360 strategy : 6.63 million
Ps3 strategy : 2.06 million
360 : Ps3 = 3.0 + ( rare genre on consoles + Halo wars )

360 other : 43.75 including kinect adventures.
PS3 other : 24.48 million
360 : Ps3 = 1.7 with kinect adventures
360 : Ps3 = 1.37 without kinect adventures

360 fighter : 24.21 million
PS3 fighter : 26.63 million
PS3 : 360 =1.1

Genres that PS3 leads = fighters, platformers and action games.
Genres that 360 leads = Everything else.
Ties = Racing.

What we can observe from this is that shooters and fpses are extremely popular in comparison on the 360. Everything else sells almost the same except for action games and platformers.

If you add the fps and shooter category :
360 = 155.02 million
Ps3 = 88.2 million
Ratio = 1.757

As you can see, the Ps3 sells almost the same as the 360 in almost every genre except for shooters and RPGs.
Due to one year lead and heavier install base in America 360 should by default sell more in there. But that's not the case.

EDIT: I forgot to mention that PS3 highest selling genre is actually action, unlike the 360 which is fps.

So the whole call of duty is the highest selling game blah blah blah doesn't work for the PS3.

*Smackdown vs. RAW does not include the 2007 edition numbers, since there are no numbers for the PS3 for that (not on it?)

There. I don't know what that means, except that the old saying "PS3 users don't buy games" is not holding up.

Thanks for posting that.  It does seem to clear up a lot.  Did you go through the trouble of looking all of that up yourself?  If so, thanks.  I'm hoping that it proves that, whenever the exact same game is available for both consoles, they balance out fairly similarly in sales.  It would be cool if there was a similar list made for multi-plats released in the last twelve months since the userbase is almost a tie, now.  It would be cool if, percentage wise, an almost equal number of PS3 users and 360 owners bought the same game.  Of course, other factors (multi-console owners, online preference, console exclusive competition, etc) would have an effect on who bought what at what time.  Still, I'm glad you posted that.  It's my hope that people realize that PS3/360 owners are more alike than we think.

Yep. Did it on my own. But was worth it.