My personal fav
Nlarge
Hvy 900 is a good one too.
I also like optimum serious mass.
I choose Nlarge b/c it mixes well for me.
Nlarge has the most protein out of all of them, 52.
Smass = 50. Hvy = 35 (or something near that)
Less calories, but IMO a _cleaner_ gainer. Good protein/carb ratio with decent amount of calories -- 600.
Best of luck.
Pject