I own both boards, but my Mana is the 10'0" version. For flat water paddling definitely go with the 12'6" Naish One. The Mana was my first board and after two months I was looking for something a little faster. DJ's right, if you plan to be in the surf a lot the Mana has a lot more rocker, but for mostly flat water the Naish One is the way to go. After a couple of months with the Naish One, I'm now looking at a 12'6" or 14" Naish Glide, can't stop the fever

Tom