At the end of the day you need to decide just what you expect from the airplane. I can tell you two things that can make or break any airplane. First one is setup. Second is having precise servos. If you are the type who pugs servos into your RX, makes sure the surface moves the right direction and then goes flying then any servo with enough power will do. On the other hand, if you take the time to set up nice linkage geometry, measure to make sure you have equal aileron travel, use the correct amount of aileron differential to eliminate adverse yaw, check and set appropriate incidence, thrust angles, CG etc. then you may want to look for a nice set of digital servos from Savox, MKS or KST.