If you're using 12V nominal panels, both styles of controllers, PWM and MPPT will be very close in efficiency. MPPT has the advantage of taking higher voltage and converting that to current to the battery. It operates on the "knee" of greatest power efficiency from the panel. MPPT sometimes suffers loss in extremely high temperatures.
For 200W of portable panels, buy the cheaper PWM controller. When you tire of lugging solar panels in and out or have one fall over and break, you'll be ready for serious solar mounted on the roof.
FWIW, I actually use one 24V nominal panel mounted on the roof with an MPPT controller. It fits my current needs.