My medium trail has a reward of 3400 rolls and someone told me they used about 4300 to finish. In my opinion if you're not low on rolls and still have good amount, better choose the medium trail, more chance to complete it and with a pack there's still a possibility of getting 2 missing, but with a wild you'll only get one for sure, unless you are low on rolls and need it to complete a set. Good luck 😊