I have a harness that resembles the "Pure" (it's just not ScubaPro brand), and I really like it. I was at first looking at the "fancy" harnesses with sternum straps and the like, and I initially thought: "Well, I like those things in a land backpack, and the harness looks like a backpack, so I want them." But I did a search here, and read a bunch of previous threads on the topic, and the people whose responses made the most sense to me were saying to try the basic (like the pure) harness first.
I did that..... and have never found a reason to change it. I love it! Even diving in Florida in the summer (so only a Lycra dive skin), it's very comfortable. And after I thought about it more: Unless you are hiking in fair distances to your dive sites, you are never really in the same "vertical" position as you are when wearing a backpack. For me, even with the shoulder straps "loose" (as they are recommended to be), they never want to come off, and mostly don't even touch me. And yet the rig is really secure (one of the things I love about it).
A bit less than a year ago, I hurt my shoulder and then got "frozen shoulder" on top of that. That's been fun
When it got to the point where I could consider diving again, I figured I would probably have to add a quick-release buckle on the shoulder strap(s), so that I could still don & doff (shoulder was not only very sore but my range of motion was terrible). Then I decided to just try it first (brought a buckle and sewing kit along). I did loosen the shoulder straps a touch (but the rig still stays nicely in place - at least on me - due to the waist band and the crotch strap). As it turns out, by being a bit methodical, it was fine. And I even donned and doffed my rig in the water the first ten-or-so dives (then I discovered that striding in with it on was okay, so after that I only doffed in-water).
So... a bit long-winded, but just to say that my recommendation would be to try the most simple, basic harness first and see how it works for you in the water (presuming long hikes aren't a factor).
Blue Sparkle