it would be a guess, but I agree with bigholla on , you want to match up your peep to the sight if you can, draw lenght I think makes a difference on needs then, and size of your peep
many cases I think bigger is better, but then again, more likely to get bumped as well/
I would honestly think that any good bow shop with let you try both first and then see what one you like best!
that would be my suggestions, besides looking for feedback here from fellow guys with them, nothing like seeing for yourself on your bow is my 2 cents?