Won't make a great deal of difference Shawn. Being flat you won't need especially high or low gears so closer ratio is best. 11/23 cassette would be typical, 11 or 12/21 probably better still. And whether compact or standard front rings you will only use the larger one.
Really wouldn't concern yourself too much though, might be better riding what you are used to out on the road.
All you need for a crit is good legs and light wheels for all the accelerations.