The two ESC's are the same. The only difference is the motors they come with in combos.
Rusty - MERV - Pede 4x4-Alias
SPC Lipo Power
The sidewinder sct is recommended to run with 2s lipo on 1/10 vehicles, can be run with 3s on lighter trucks or lower kv motors, in your case is fine since the merv is 1/16 so you can run with any of those.
The sv2 has been a popular chose so far.
Rally SV2/4600 and fully loaded
thats what i thought
Sidewinder SCT is meant for Trucks and such too. For example, SCT is what we stampede and slash guys use. more "Torquey" If im not wrong.