Timing Belts vs. Rack and Pinion drive

I am building a 4' x 10' cnc plasma cutter. Does anyone have experience
using timing belts vs. a rack and pinion drive for the gantry system? I
am planning to use a 200 oz-in stepper for the trolley and a 300 oz-in
stepper for the bridge drive.

I have a design in mind that will use a stationary timing belt along the
x axis with the motor mounted to the bridge. The trolley (torch mount)
would be moved with a continuous belt (band) where the motor is fixed to
the bridge.

Any input would be appreciated as this is my first cnc project.

Thanks,
Terry