If we anyalyse this, and pretend not to be dim as ducks.
GTA SA sales for Ps2: 0.4M in Japan out of a base of 21M. You can really forget getting any sales from there, so it's + 2 Brawl here.
GTA SA sales for Ps2: 6.6M. As there are now less than 10M Ps3+ 360 sold in Europe, I doubt it will sell more than 2-3M here. Brawl, will be likely to sell how much? Hmm, 1M SSBM out of less than 5M, and the series had a big bump from the original. Currently the Wii has 6.5M in Europe, and it will have 7 within the time. There will also be extra hype, due to it comming out late, so I guess it has a shot at 2M. So about 500K + GTA 4 here.
NA. Here the bases are 14M to 9M. Smash sold 4M here, out of a 10M base. By the time Brawl is out, the base might be up to 10M here too, so let's say 4-5 ish. GTA did roughly 2/3 of its sales here, so we can assume 5-6M at least, I'd say 6M. That's 1500K + GTA 4 here.
To sum it up: it's close, as everybody knew, I didn't find out anything.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS