I am thinking of getting either the viper copperhead 4500kv combo with the pro gauge or the tenshock and hobbywing sc411 combo.
I will be using it in a LOSI SCTE 1.0 with turnigy nano techs 5300mah 50-100c and a flysky gt3c I think and a savox servo. Possibly updating the servo to a hitech.

What is your opinion on either?

I went with the Viper Copperhead R combo with the 4500kv motor for a SCTE 1.0 for my son to bash with and it rips. Using the same radio and I went with the Solar D772 servo for it's combo of torque, reasonable speed and super low cost. I actually got 2 of them just in case.

If you are racing, just get the hobbywing sct pro combo. It's sensored, and performs just as well as the higher dollar systems.