I have a Bob Marshall, an Ortho- Flex Express Lite, and a really old Billy Cook.
I like that the Ortho-Flex and the Bob Marshall are both very lightweight. I also like the fact that I can use them both on different horses with different builds. They both seem to keep their re-sale value, which is also a plus.
I love my Billy Cook, but I wish it wasn't quite so heavy. I do feel that it provides a little more security, but that could be because it's a Western style saddle and my other 2 are endurance saddles.
Horses aren't my whole life...They make my life whole.