RE: Recommendations on 50cc 2-Stroke
The MVVS is at the top of the power class, but also the top of the weight class. Since it might be for a warbird it would be an excellent choice. Next in line for that reason would be the 3w.
I left DA out of the list since they make both a 50 and a 60, creating a selection dilemma. Power wise the DA 50 falls after the DLE 55, price is equal to the BME 58. The DA 60 fits right next to the DLE 55 and BME 58, but slightly higher pricing. Quality for both is high.
Interesting that the OP included decision making criteria in his original question. Typically of late is cost being the entire qualifier in the decision making process. It's good to see someone still understands there's more to the selection equation than cost alone.