SNG's are good due to lower variance. MTT's while much higher variance, even one micro win would be a good BR for that level.
For consistently building, I would go with SNG's since MTT's can have large downswings. The one thing I suggest though about using SNG's. Play one type, and only one type until you become a expert at that game. Different SNG's with different amount of players and structures are played differently. So play around, find the type you like, and then play that one only until you are really good at it. Then you always have a game you can go back to profit from if you need to.