The maximum current on my motors are 4A, but that's only around stall, they typically run around 1-2A, so I have have a TIP120 and an L298 in series for each motor.
As retrolefty already said, it's never a good idea to operate electronics at or near their limits. Doing so severely reduces the life expectancy and robustness of the circuit. If it's a personal project, then it's a personal decision, so long as you understand the potential consequences down the road. However, if you mix it with this...
sync:
No, i do not have lots of knowledge and experience but i'm ok with programming Arduino. I have to get 50+ units, would it be smart to go DIY and be guided ?
It's highly unlikely he needs 50+ units for his own personal use. In those quantities, it's literally a necessity to use a robust, stable, and long lasting solution. The consequences of not doing so are far more significant than when dealing with a one off setup.