MTT's vs 9-man SnG's

Just a quick question, which of the above do you find more profitable. Ive not been playing very long and am really just restricting myself to 1$ SnGs due to my bankroll (though im finally turning over a small profit). It seems to me that when i do enter a MTT (either 45 man or 90 man) i get smaller or the same amount of return as in a 9-man SnG but taking much longer. This is probably due to me finishing 6th or 7th instead of in the top 3.

Eitherway which is the most profitable in the long term, and when should one be entering MTT's?

Thanks

I would say SnGs are better. (a matter of taste, obv.)
you could play several SnGs at a time
I prefer the 2 table SnGs, double prizepool, same buy in

I prefer the 3 or 5 table SNGs. You pay out less, but there's a chance for a decent payout if you win.