The best thing would be to try a few on the horse, if that's possible. As far as brand goes, most saddles on the market all have the same tree (plastic - ralide). A lot would have to do with what the saddle will be used for - trails, show, etc. and how often it is used - big difference between occasional rider v. heavy use.
Personally, I"m not too crazy about either abetta or king. Always better to just get a decent leather saddle made with American leather. I'd suggest Circle Y for a leather, or Billy Cook - you can find deals as kitten Val said, on Ebay, craigslist, and even classifieds like equine.com.
If you're stuck on a synthetic, I've heard that Fabtron is really good.
Any way you go, it's more important for a great saddle fit on the horse first, rider second, and saddle material should be lower on the list. You won't know what fits the horse until you put some on it. Good Luck.
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