Re: Yamaha vs Selmer
Hard to say. Chateau, Antigua, and Cannonball have distribution to brick and mortar music stores, so you can try them in the stores. I forgot Jupiter, which makes pretty good Yamaha clones. They're also in stores. I suspect Cannonball might be a bit pricier than the other brands. I think they all have dealers listed online.
Kessler Music is a store in Las Vegas with a very reasonably priced house brand. You can order their products online and they have a trial policy.
If you're looking for a student Alto, Saxgourmet has the Bon Fils model available online.
All of the brands I mentioned market well made Asian horns. There are also a lot of not so good Asian horns, so be careful with unfamiliar brands.