one disadvantage about PS 3 engines are that when they have a board problem, the board generally cannot not be repaired, where as if you have a PS 2 3 volt board I would say about 90 % of the time the older ps2 3 volt boards can be repaired pretty reasonably by GGG , George ASC repair Tech who lives in Virigina and is on this forum and is always glad to help some one or repair your ps2 3 volt boards as well!
I think Mth make great trains and have excellent support, helped me many a time and ship rather quickly!
Alan