I started out learning the basics in western, but found many reasons to switch to english: First off, the saddles were terribly uncomfortable- a quality and comfortable western saddle is more expensive than an english one. Secondly, the saddles are far too heavy for me- I'm very small, and have mechanical issues in my hands which make it nearly impossible for me to tack up my horses with western saddles- for the most part, the better quality the saddle, the heavier, so my only option would be a less than desireable synthetic.
Thirdly... I find a forward position far more comfortable than a traditional western seat- sitting a trot and canter take a lot more energy than posting or "jockey seating" a trot or riding the canter in the forward seat. Since I will sometimes ride multiple horses in an afternoon, (and usually less than well-mannered ones, at that!), I find it exhausting!
The western saddles I was raised with are just plain uncomfortable. Mind you, I was raised at a massive but not necessarily rich lesson barn, and a summer camp owning fourty horses- neither could afford a nice, comfortable saddle for all of the horses. It was just not possible. And if you've ever ridden in a low-end western, you know that it's like sitting on a rock. A rock that rubs and chaffes, at that.
I broke my tailbone a couple summers back after falling down a flight of stairs, and the combination of where a poorly made western saddle hits your tailbone and sitting every gait makes it terribly uncomfortable- the last segment or two of my spine are now crooked and tilted in towards my body, and my weight actually ends up on the third segment, which isn't designed for constant pressure like that.
I, too, have trouble finding a quality western trainer where I live. When I first began riding, I was terribly in love with the idea of barrel racing, but was crushed to discover that barrel horses, barrel competitions, and barrel trainers do not exist in the suburbs of Chicago. The very very few trainers available in western sports were just too high level and expensive for me to work with.
But, you know the ironic part? After all these years of knocking western saddles and riders... I just got a job training gaited trail horses- and guess how we ride? That's right. Western.
The trainer I work for is quite particular about his tack, which means every saddle is very high quality (most are about a hundred years old- old saddles were built extremely well and last forever, and they're far more comfortable than most saddles you can buy new these days), and the fact that all of my horses are gaited means that there's no bouncing, and if I'm not trotting or cantering, I don't need to use as much energy in moving with the horse at a trot or canter! The cherry on the top? Since my boss is so particular about his tack, he insists on tacking up my horses- I don't even have to touch my heavy saddles until I'm mounting! This works out quite nicely
I agree with LMS- I think english riding demands more preciseness from the riders- western, I've found, gives more responsibility to the horse and tack. While I'm much happier in western gear these days (while I never felt insecure in my english tack, since switching to western, I've ridden through some horribly raunchy spooks, temper tantrums, rears, and bucks- I NEVER would've stayed on in my close contact!), I will never ever regret my english training- they really drill proper positioning and aids into your mind, and now it's all second nature. I can't even ride a chair seat if I tried!
Both training styles have unique and beneficial attributes- I think that every rider should spend at least six months seriously training in each. Trainers from different disciplines have different perspectives on horse training and behavior, and they focus on different aspects of riding- there's always something to gain by trying something new.