Of the three, I would probably try the Fabtron. It’s new, it’s synthetic, you won’t have to break in the fenders, and it probably doesn’t weigh so much that you would have trouble putting it easily on your horse’s back instead of swinging it up and thumping it down.
The first one probably is not a Simco or a Big Horn, since it doesn’t have a visible maker’s mark. That seat looks awfully uncomfortable to me. The second one’s seat looks more comfortable but the saddle itself doesn’t.
I loved my synthetic western saddle. It wasn’t a Fabtron, but it was made of similar materials and didn’t required any breaking in or a broomstick through the stirrups.
What saddle did your horse wear before you got him? Did it fit him? Is it for sale?
Buy the best saddle you can afford that fits your horse and you, in that order. Be sure you can adjust the stirrups to the correct length for you (I have short legs and a lot of western saddles with Blevins buckles don’t have enough holes to shorten the stirrups enough for me. I hate Blevins buckles anyway but if you don’t let a lot of other people use your saddle you shouldn’t have to adjust the stirrups a lot.) Be sure whichever saddle you buy has stirrup hobbles; I see that all three of these saddles have them.
ETA: quote from Saddle #1:
“that old western style that you don’t see in the new models.”
Umm … there’s a good reason you don’t!
I haven’t seen one of those “elephant ear” cantles in 30-40 years! (Nothing wrong with them, I just haven’t seen one in so long.)