Hi,

What is far more important than thrust vs revs (unless you are into pylon racing) is the reliability and longevity of the motor. Choose a reputable brand of motor in the size needed to power (or overpower) your model and experiment with props to find what best suits your model and flying style.
In a very rough analogy pitch on the prop is like the gear ratios on your car the lower the pitch the lower the gear, the higher the pitch the higher the gear=speed.

Cheers,

Colin