HPS for yield and MH for quality. both will be decent yields. but MH puts out something like 75k lumens vs hps putting out 95k.. so about 20-25% more yield i would imagine but the MH will be frostier from what I have read and seen. LEC and LED are where its at though for quality buds.. if i were you I would run the HPS bulb or otherwise buy the LED/LEC when you can afford to.