Iso Mass Xtreme Gainer vs. Optimum Nutritition's Serious Mass?

[right330]

Hey everyone! First post here...


So, I have these two supplement jugs at home:


IsoMass Xtreme Gainer


Optimum Nutritition's Serious Mass


Here are the nutrition specs (servings adjusted for one scoop with 16oz of water):


IsoMass also contains these (also adjusted for 1 scoop):
ISOLATES 24g
CARBO 20g
CREATINE 2.3g
OMEGA 2.2g
VITAMIN 1.1g
GLUTAMINE 0.7g
N.O. 500mg
BCAA 183mg
CP 167mg
ENZYME 83mg


Considering I'm 10lbs underweight, what do you guys think would be better for me to take? Would it be okay to mix and match? If so, which one's better when (pre-workout, post-workout, before bed, etc)?

Thanks!