Motor Driver for line follower robot

Hi All

Currently I am using TB6612FNG Motor Driver for my commercial project (Line follower robot) .It has two motors

All power consumption below 10W 

I need little higher performance  Motor Driver better that TB6612FNG 

The size of the motor driver should almost same as TB6612FNG 

Motor Specification 

No-load speed @ 12V: 650 rpm

No-load current @ 12V: 0.06 A

Stall current @ 12V: 0.75 A

Max output power @ 12V: 1.1 W

Note

Also I suppose to use 6v motors  with project 

Please advice 

Thanks in advanced