Competing both in sleeves and in wraps (obviously not in the same meet) is still an option. Personally, I tried squatting in wraps when I was doing the RTS generalized intermediate program a couple years ago, it has wrapped squats as an overload. I hated the wraps and didn't get much caryover to my squat out of it either, but my technique sucked too. At this point I'm thinking of doing a meet in wraps in the near future, there are a couple RPS meets around here each year, but mostly I'm going to stick with sleeves. Unless I can win $40000 at the USPA open, but that won't happen anytime soon.
Most (good) lifters that compete in wraps still do a lot of work without wraps too, if you are far out from a meet you might not use wraps at all. Something to consider.
To answer you original question
Try working up to a max or near max without wraps, then next week do it with wraps. No easier way to tell. You could also go by estimated 1rm based off rep maxes, like 2-5rm, rather than actually maxing out.