I use a variety of plates with the
Diverite Transplate Harness.
Mine is 7 years old, and I just ordered a replacement harness about an hour ago. I tend to lift the bcd with a steel 108 tank attached by one strap when I don the gear. Even with that extreme weight, I've never had any of the buckles come apart. I am replacing it because the webbing is getting pretty ratty and I'm sure the plastic buckles will eventually give.
I've got a steel diverite backplate, a plastic diverite backplate (not sure they sell these anymore) and an apeks aluminum plate. Although I've used it on all three, I put a "hogarthian" harness onto the plastic plate a couple years ago so I don't use the transplate with that backplate anymore.
I REALLY like the transplate setup over a basic hogarthian harness. If you carry your tank on the bcd for any distance (shore diving for example), the shoulder pads are fantastic. The quick release buckles on the shoulder straps are nice, and the whole thing is far easier to adjust than a standard hogarthian. You'll probably want to adjust if you switch exposure protection much. For example, in springs I use either 7mm wetsuit or a drysuit. When I go to Cozumel I dive with a skin or just shorts. You could leave a hogarthian rigged for the biggest option and just have it be a little loose when in warmer water. Or you could go to the trouble of re-adjusting the hogarthian. It's just super easy to do with the transplate harness. Takes about 2 seconds literally.
When I use aluminum tanks, I also have to carry weights. I got the diverite ditchable weight pouches for that. I hate weight belts, they are sucktacular imo.
Hogarthian is definitely far cheaper, you could probably get the webbing and hardware for $50, and plates generally are $100 or less for most plates. Many believe hogarthian is superior for various reasons. I simply disagree.
I use a diverite rec exp wing. It's got a replaceable bladder (I've had to replace it once in the 7 years, under $100) and I've replaced the power inflator a few times (currently I'm using an AIR2). The wing I've got is actually far larger than I need. Sooner or later, I'll get around to ordering a smaller wing to reduce drag. It's supposed to be a "singles/doubles" wing but I think it might be a little on the small side for backmount doubles, and it's a bit on the large side for single tanks.