Let's Make Robots!

what H-bridge configuration should i choice

hallo.

I have googled a little around and found they sabertooth controllers.

i need 20A on each motor in my projekt and have 4 motors.

Should i choice 2 of this:
http://www.dimensionengineering.com/products/sabertooth2x25 

or 1 of this and put 2 motors on eatch output:
http://www.dimensionengineering.com/products/sabertooth2x50hv