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Mucel said..
I would like to see a light wind performance benchmark between wingfoiling and windfoiling using the same foil size, sail/wing size, similar board, and similar guy weight
I assume with "performance benchmark", you mean how well you can get going. I cannot give you the "same size" benchmark, but I can give you a different comparison that allows some conclusions. I've been windsurfing with my wife for more than 10 years, with similar skills on the windsurfer but different (steady) weights. On the windsurfer, there was a predictable difference in sail sizes that would get us going the same way, for example 5.6 for me and 4.5 for her, or 6.5 and 5.2 (on 90 l and 110 l boards, giving us similar flotation).
When we got past the beginner level at wind foiling, the size differences remained the same. She used an i76, I used the i84.
When she switched to winging, she initially used a larger foil, either an i84 or i99. After a year, she switched to a foil more comparable to the i76 in size (Armstrong 1550 V2). There was a bit of a learning curve on that foil; she had a hard time getting going in the first sessions, and a higher wind minimum than on the i84. But after figuring out the foil, we are now back to similar sail/wing size differences, typically 6.5 and 5.4 or 5.6 and 4.2. But now, I slog a lot more than she does when it is marginal. She can get going a bit earlier, but the even bigger difference is that she almost never comes of the foil unless she tries stuff like 360s or foil tacks (which she foils through only on flat water). She's done 2 hour sessions where she had to start just 2 or 3 times, with lots of swell riding (which she regards as much more fun on the wing than with a sail) during the session.
My takeaway is that winging has a better bottom end than freeride foiling, but that it may take some time to develop the skills to get there (one year in her case, but she's a quick learner with lots of TOW). Many wingers you may see on the water are beginners or intermediates, and may not yet have the skills to get the most out of the wings at the bottom end.