I just go with the cheapest price as long as it's pure creatine monohydrate. Just dumping it in water works for me so I use the powder. You can find it in bulk for quite a bit easier.
Funny story I was going out west for vacation and put a week or so work of powder in a zip lock bag in my luggage. When I got there in my luggage was a TSA receipt that they had been in my bag and a friendly note suggesting I label the bag next time. They said the belt and lifting shoes had clued them into what is was.