I bought a prospec and sold my 710.
I think the designs of the MTX3 is a little better. I looks more like an 1/8th than the serpent and drives great out of the box.
Things i dislike about my 710:
Poor centax response.
Fragile car (breaks easily)
Needs alot of setup to get it working right
Things i like about the MTX3
Responsive centax
Strong chassis
Great handling out of the box
Parts are cheaper then serpent
Comparable quality
Stock gear diff !
Many lightweight an Ti. upgrades to Improve cars strenght.
at the end, I guess both cars are great, I just found the MTX3 to work better for me.