9-man vs 18-man SnGs

[Nsight7]

I was going to say, I have played MORE than 20 games of both, but as I haven't played hundreds of games of the 18-man SnGs I really don't know what conclusion to draw. Theoretically I think the 18-man is likely more profitable (probably a bit more variance though), but I don't have the statistical evidence to back that up.

I suppose I am looking for both some further theoretical insight and perhaps some statistical evidence indicating which is the better profit venture.