I have a 19 pound halcyon wing, and the 27 pound wing....The issues I see relate to my tank choice....If I am using an Al 80, the 19 pound wing is the most ideal by far--it is the slickest, allowing the best glides between kick strokes, the least work in propulsion, so the best bottom time.
If I use our hp100 tanks ( the one's we have are the heaviest 100's I have ever heard of), the 19 pound lift wing has to be almost fully inflated to get neutral at the beginning of the dive. This is with the steel backplate and a big light cannister--which I use with whatever wing I attach.
I used to sometimes use LP 120 tanks, which were less negative than the hp100's...so were also OK with the 19 pound wing...
I like to have more potential lift in the wing to compensate for cameras and the needs of helping another diver at the surface....I have been in the situation when using an HP100 mated to a 19# wing, where I came up with some other divers, and one was having issues with a BC failure, and was freaked, and I had to support this other diver on the surface, plus my camera, and myself....this meant that with the 19 pound wing, I was staying on the surface by doing a 1.5 mph swim effort straight up---swimming upward this hard at the surface to stay there.....fortunately the boat arrived within about 5 minutes, but it was a tiring event that I could imagine occurring again---which means my gear choice with the 19# wing was a poor choice if I wanted to be easily able to support a buddy. The 28 pound lift wing would have been ideal for this...and had I been using the Al 80 tank, so would the 19 # wing.... My wetsuit is a 2.5 mil freedive suit, with very little buoyancy--without a tank on, I need about 7 pounds on a weightbelt to be neutral.
So the other factor for you---if you are normally needing to use 12 pounds of weight on a belt or more, then again, the 19# wing may be better--as the one dive in many hundred where you might need to support another dive issue would be worth just dropping the weightbelt at the surface--for the added streamlining....and if you needed more weight than me, then the 19 is delivering more lift for the heavy tank also.