You can’t really go wrong with either. If you plan on fishing from it year round and every week/day, I would get the 12.5. The extra few feet go a long way in performance, storage, and deck space. If you are fishing every now and then and want to save some money, the 10,6 will be fine. I have the Bigwater 132 and love it. It is a tank on land but a dream in the water. I have a tacoma with a 5.5 bed and Yakima extender that handles it with no problem. Check out after market stuff made by Nick at navarrekayakfishing.com.