6'2" even (measured barefoot and at end of the day)
I ride an 06 XL Stumpy FSR and LOVE it. I demo'ed a L but it just felt small. It was nimble and flickable but for the type of riding I would be doing it would not have been comfortable. The cockpit felt too small and the seat was too far forward. The LBS had to special order the XL. The first time out on it I thought "...this is a big bike, did I make a mistake?" 5 minutes later I am blasting over curbs and looking for any obstacles to ride down, over, or under. 1 year and a few months later, I have no regrets. I did pick up a shorter stem (thanks mopartodd) to reduce the stretched feel.
You really need to ride both to determine which one you prefer. I have read about 6'4" riders on L Stumpys and 6'0" riders on XL Stumpys. If you still can't make up your mind, then you will need to take the bike out for a longer test ride. From demo'ing both, the L felt wrong immediately. The XL felt really big but it was comfortable.