Something else to consider and add to confusion with regard to pants...
I like multi-function... Take a look at Fjallraven's Keb Gaiter Trousers, they are unique zip-offs. After doing a bunch of research, I will be using these pants this year.
1) The lower leg, seat bottom, knees and front thigh are made of brush proof material. The back of the thigh and area above the seat bottom are stretch material so they are super flexible for climbing. Crotch is gusseted.
2) The lower legs zip off and turn into gaiters- complete with a hook to grab your boot laces and drawstring for your calves. If you want to take the lower legs off completely while your boots are on, they also have side zippers.
3) The sides of pants also zip open at the thigh to help keep you cool while climbing. Thus, you can vent the pant while it is in full long-pant conformation, or if you're super hot while climbing in shorts, you can vent them too.
You can also wax the gaiters to make them even more waterproof. Fjallraven has a number of videos about this.
Good luck with gear choices!
JL