Northwoods, honestly, on your back, the plates all feel remarkably similar. The biggest difference you will notice over time is how you trim out with the plates and your choice of tank(s). My SS plate (Halcyon) is great. I've also used a Dive Rite, Koplin, and Golem. All remarkably similar. Honestly, in terms of backplates, I feel the DSS is the best out there right now. Other manufacturers have their "thing" and that's fine too.
Right now, I am in the market for my second backplate because my SS plate trims me out terribly in my drysuit with steel tanks. I'm too head heavy. My choice is the DSS Kydex plate. It's the right tool for the job, but that BP won't be my choice for diving wet. My SS plate does a far better job for that.
Good luck in whatever you choose, but take note as to who is on here answering questions. Tobin is here every day helping new users. That speaks volumes. Jakub (owner of Golem Gea) isn't here as regularly, but does come here. Patrick (Owner of Oxycheq) is here. Jordan from Dive Rite is here. These people stand behind what they sell, and really put themselves out there for the customer.