I thought I wanted to learn jumping. Bought an Arabian mare and tried to learn to ride. She did lots of jumping...sideways. We did lots of spins, but that had nothing to do with reining, and we did a fair bit of galloping which had nothing to do with racing.
Over time, I realized I had little interest in jumping. There isn't much to jump in the Sonoran Desert. If you can't see the other side, you can assume it is filled with cactus. However, an HF moderator recommended VS Littauer, and the forward seat he taught kept me ON my horse.
With time, though, I realized the forward seat is as oversold by its enthusiasts (including me!) as a dressage seat is by its, and western riding is by its enthusiasts. At this point in my life, I ride in a western saddle. Sometimes in a forward seat. Sometimes in a position a cowboy from 1885 would relate to. And sometimes with ear, shoulder, hip and heel in a vertical line. Sometimes one hand. Sometimes two. Sometimes snaffle Sometimes curb. And I may use all those, and points in between, while riding just a half mile.
Littauer said the only real test of one's position were these two things:
1 - Do you move in fluid balance with the motion of your horse?
2 - Does your position allow you to cue your horse the way you need to do to control him?
It seems to me that if I want to continually be in "fluid balance" with my horse, then my position needs to be fluid as we do different things.
Starting off, learn one approach. Any of them. Doesn't matter which. But be flexible, and be ready to change your position and your approach to match your horse and your goal on any given day. In all one's riding, think "balance" not "position", and realize that folks who ride differently may have reasons why. Fluid.