Hi,
Maybe I can help...
I have been the BP/wings route, then went to a Mares BC then back to the BP and wing - because I hadn't gotten the bugs properly worked out of my BP rig from the get go. If you can, TRY and see if a LDS will let you dive a rig or two and make your own evaluations..for yourself.
I went to the Mares Syncro Power Tech BC because it looked like it'd be good for rec diving. Diving it I found the back inflation worked well and buoyancy was fine, but I couldn't actually see or feel the shoulder mounted D-rings nor access the zippered front pockets with the BC on and in my 6.5mm cold water wetsuit on...so they were practically worthless to me. I found the cummerbunds proportional 'fit' not the same as the rest of the BC. For example, the BC fit the chest area perfectly, but when the cummerbund was let out more, the ends no longer would attach via Velcro to the back 'spine' area. That seemed like an oversight on design to me. Could have just been the way it fit me. I found that wasn't an issue with BP's.
I'm sure you know what you are seeking and why, as I did as well. But I found what looked great in the ads didn't 'work' as I expected after I had read through all of the features Mares listed on the BC. I mean, 4 or 6 D-rings sounds very useful in the ads, but heck, if you can't REACH any of them, or even SEE one of them, how could they be useful?
I wound up going back to the BP and wing and won't go back.
Hate to see someone make a costly decision like mine was, so if you can get with a few rigs and try them out - go for it. It might same you some time, money and aggravation.