Mayfield is closer. Both are great. Mayfield has shorter falls and is more of a large stream walk. Very refreshing and natural. Cool, fresh water. It's much quieter, less busy/touristy than YS. YS has zip lining available, a much bigger, developed operation. I added on with 3 other people for $40 CAD to YS and paid entrance fees, tips, drinks, eats. Should be same or a bit cheaper to Mayfield depending how many are going. Mayfield offers a delicious chicken lunch. Personal guides at Mayfield work for tips only and are wonderful, taking many pics of you with your camera. Enjoy!