Ultimaker 2 hands down! That new extruder on the Gen 5 Maker Bots are problamatic and you are stuck for the most part with their software. Go Open Source and buy the Ultimaker 2. We have 3 MakerBots, an Ultimaker 2, CUBE 3, several Prusa i3s, an awesome little Printrbot Simple (which I love) and a couple of Kossel Deltas. When we have to make a part for someone that has to be precise, we always go to the Ultimaker 2!