Microsoft said 3:1 for Black Friday alone.
If we say that the other days, there was sold ~ 30K for X360 (27K last week) and 15-20K for Ps3 (13K last week).
Thanksgiving is closed, but as the other days are likely to be higher than last week, that gets evened out.
So, for the 6 non-BF days.
X360: 180K
Ps3: 102K
For BF alone, this leaves
X360: 297K
Ps3: 96K
Which is pretty much exactly 3 times as much.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS