Very different grip styles, mass weight, and riser shapes. I own both in the recent production models and like both but if I had to choose one it would be the 59er as it seems to shoot more accurately for me due, I guess, to the differences mentioned. I shoot longbows a lot and the 59er resembles the feel of those grips more. Both are fine bows. My only complaint about the new 59ers is the leather used on the grip. It just doesn't match the quality of the rest of the bow. I had Big Jim replace it with brown beaver tail--really improved the looks and gives you a very secure feeling grip--sort of like a checkered grip.