I can't stress it enough though, for the ball you're using stick to a dual stamp.
ASA only new stamp is not designed for balls harder than 52/300. While some may say my ____ has lasted ____ hits, it could be they are a weaker hitter or having good luck. This could mean warranty voided, if for any reason Demarini determines the bat broke due to hitting harder balls than 52/300. Unlikely to happen frankly, but still a possibility.
The dual stamp will break in with some love, and hit the 52's well, but also perform as good as a Utrip bat would with the harder balls. My 2015 One was as good as the CL22 Utrip bat. The difference came down to the load and 12" vs 13" barrels only.
In terms of your question about differences, someone else said paint. I find this true between the 2015 ONE and the Ltd Ed Yeti and Chupa (Kraken was a CL22 Ltd Ed Paint)
The 2014 ONE was good, and once broken in I would say on the same level as the 2015. But the 2015 for us took a lot less work to get going and get hot. At the prices they go for now, the 2015 is the no brainer choice.
Can't speak for the 2016 yet. Haven't swung it and not likely to. :thumb: