don't know much about the others that you have mentioned. but when i was looking into a buggys for a twin engine conversion i decided on the mp777. and to honest i have had no trouble with the drive chain on the mp777.
yes it will probably be a little heavier than the others, but they are about the strongest you can get.
i acheived 75mph at a uk speed event. the car had 2 rb c6bb engines in it then, my only restriction on going faster was the gearing.
chris