It depends on your budget, and your preference. Creapure is essentially micronized creatine monohydrate, which is good, because it's unadulterated. 10 grams of mono is ten grams of mono, as opposed to other types of creatine that have things like chelates, and esters factored in to the weight, as delivery vehicles. On the other hand, monohydrate suffers from poor absorption, and makes some bloat up like an emotional eater chick on the rag. For some it works the best, and for some like me, the mere mention of monohydrate makes me run to the throne. SizeON contains creatine gluconate, which is supposedly the most effective creatine on the market, along with some other goodies. I'd go the creapure route first, as it's cheaper, and see how it works for you. Oh, and don't forget about the BCAA's if you're cutting