I would never just rely on one persons training techniques. Take a little bit of knowledge from all.
THIS!!!! Well said!!
It seems PP has some gimmicks that are kind of hokey and didn't work with my gelding when I was starting under saddle. The whole "walk with your body and your horse will walk" thing was a wash, as well as "trot w/ your body" and "canter w/ your body". My Teddy thought I was wacky, sitting up there rocking. He thought I had ADD.
That whole exercise is a really simplistic version of something that does work when done correctly. The thing is, for a horse who is not used to seat aids, you actually might need to back up the cue with something that he is more familiar with, i.e., leg or whip. Over time, the horse becomes sensitized to seat aids, and you can get really light and subtle in your transitions. This is one of my major issues with Parelli - he makes simple things much harder than they need to be (The whole zone system fries my brain, lol
), and some more advanced ideas, such as seat aids, get reduced to "move the way you want your horse to move" with very little explanation how, why, and what to do if that fails.
If someone had me at gunpoint and was forcing me to choose, I would have to say CA over Parelli any day. I do have one of Parelli's older books, and there are some interesting and valuable insights to be had there. As far as roundpenning, I've mostly only done lunging, akin to CA's style, mainly because I don't have a round pen. I see nothing wrong with roundpenning done right. If your horse's feet are "sticky" and he has a hard time moving forward, the comparative freedom of the round pen might be more motivating to him than lunging in the beginning.
Halters - I do see a slight difference in Scout's "handling" with a rope vs a web halter, but not enough to matter. I'll save my money and have 2 halters, one rope, one web, for a tiny fraction of the price of either Parelli's or CA's. Pressure is pressure, and any kind of halter is serviceable to the end of exerting it.