The mmp by far and away and it does work just fine on anything from 2s to 6s and you don't need a BEC under most conditions. The only time the internal BEC has issues is with servo's that have high amp draw, in 1/10 situations even w/ 4x4 sct you don't need any of those high draw servo's.. it's not a 1/8 truggy. Stick with known servo's that work well w/o issues and you need to do nothing more than plug it in and it will work flawless. What Castle didnt do was make their 1/10 esc bullet proof for 1/8 users (ps get the MMM for 1/8). Any who the Hitec HS-985MG Ultra Torque Coreless Metal Gear Servo does ~180oz/in torque, and .13 response which is more than enough and only 69. In fact I use that same servo in my 1/8 buggies and it's flawless.