I think it depends on what you are trying to achieve, If it is just a bigger bankroll, then Sit and Goes might be the best route for a slow steady increase, keeping with low stakes until you double your BR.
MTTs are always time consuming, and what you need to remember is that the number of players involved always increase the odds
against you winning, so keep the buy-ins low until you have that one big win, before you move up to higher buy-ins.
I trebled my $200.00 BR. on Pokerstars by playing $1.00 single table Bounty hunter games, the prize pool was lower than a normal SnG , but the Bounties soon add up.
Stick to a rigid Bankroll Management Strategy and you won't go too far wrong!