My hubby prefers a smooth seat saddle. Says the padded suede seats chafe. He and the other dudes at his cutting horse barn also wear the long (almost to the knee) tight fitting undies for a long day in the saddle. These are men things I know nothing about, but the gist of it seems to be that the boys need some support, and the hairs on the insides of their legs will rub/chafe and then get ingrown without something to keep the jeans off them.
I have a Sean Ryon cutting saddle and intend to be buried with it. It is expensive but definitely worth it. I have trail ridden, worked cattle, shown cutters and reiners, and everything else in it. Perfect pocket (the spot your fanny sits in) and perfect balance.
I second the cinch part. I only use either nylon or super tough leather off billets and cinch straps. Hubby had a thinner leather off billet snap in half and got dumped, breaking some of the finger things off his lower vertebrae. BAD!
Most of the pro trainers I know like the mohair cinches, but if you leave in a wet/humid area, they may get nasty. I use them, but I live in a generally dry climate. Some trainers like the neoprene cinches (one swears by smooth, saying the dimpled pull out hair; one says the smooth gall his horses, so who knows). I like the ease in taking care of them but I think the mohair is prettier.
For bridles, plain harness leather with a nice buckle says “cowboy” for not a lot of money and pretty easy to care for, just wipe down with Leather New.
I have a co-worker who is 6’5" and has ridden western his whole life. He acquired an Australian saddle somewhere along the way and now trail rides in it exclusively.
If you seriously aren’t doing anything but trail riding, I hear the treeless and/or flex tree saddles are lighter and fit more different horses better. I have never ridden in one so can’t give first hand opinion.
I like the Classic Equine saddle pads that are wool felt top and bottom, with foam in the middle, with wear leathers. The fitted design seems to stay on the horses backs nicely. I also like the all-wool pads from Diamond J.