I didn't find out the first time and it was wonderful, and this time we're going to find out. My sister found out last year when she was 18 weeks, and we were all waiting and SO Excited to hear what she was having. Id say the excitement of finding out then was the same as finding out at the birth and that's why Im going to go for it.
Everyone's different, but Im looking forward to being able to prepare a room for the baby and buy some clothes before hand. Im sure whatever you decide will be the right decision.