I would take the SL65 BS.
just because I don't like this 911 GT2 (I prefer the first 996 GT2), and I would prefer a 997 GT3 RS to the GT2.
the SL65 isn't great or anything, but it's quite exaggerated and it's body kit a la DTM somehow appeals me.
if I had to choose between the two, I would go for the bigger one, just for the sake of it.
otherwise follow Kidty thoughts, perhaps ending to a different car, but still valid arguments.