welcome to flertalk! you may want to do a seach before asking a broad ranged question. How ever that depends on what you want to do with the points. Biggest bang for the buck well it is an airline award of course in a premium class. How ever knowing what Airline program to put them in is the real question need answerd. That acorse depends on where you want to go.
With a little more info it would help in giving you the answer you are looking for.