Thunder Tiger Pro .46 Without a doubt. I have two of them and I really could not ask for an easier to live with little motor. It is a little screamer and is incredibly easy to tune and handle. I would not buy another .46 on the market today. I am not saying that there is not other great engines out there in this class but this one is the best in my opinion. Just go check the user reviews here at RCU and I think you will see most people agree.