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mr love said..
Winging on swell is more like surf foiling....you flag the wing behind and surf on the swell energy. Windfoiling on a swell is more like wave sailing where you can use the power of the sail and its a bit harder to completely get the sail to go neutral and lose all its power and purely surf. But windfoiling you can use the rig power in the carves. Just a different feel, pros and cons for each.
I think Mr Love puts it very well.
I would add, building on others thoughts IMHO there are a few general types of Wave foiling both wingers and windfoilers enjoy. I don't think anyone is better than the other but I do think it's cool that not much of any of this was going on 5 years ago. So here is my 2 cents worth:
1) Downwind going down the swells turning both ways with the sail or wing flagged. Turning the power on or pumping from time to time to help get to the next swell. Remember even with a wing it is more in front of you and if you want to change directions you have to switch hands. But the idea is to be riding only the foil using the power of the swell. From my experience wingers are all over this but I would add those looking for the pure surfing feel are moving away from using the wing to SUP or Prone foils, some with small electric drives to help get them up on foil allow them to use smaller foils. I would also add that in light winds I have chatted with folks that prefer wind foiling over winging in these conditions because the wing kind of gets back winded and gets in the way.
2) Downwind going up and down the swell in one direction with the power on in each carve. I find most windfoilers love doing this as I believe we take advantage of being able to transfer power directly from the sail to the board. Not to say I have not seen wingers grinning while doing this.
3) Riding ground swell at 90 degrees to the wind. Wingers love to flag the wing and go for that "surfing" feel carving back and forth on the face with the wing behind them however I have seen some that also like to add more power to their carves by using the wing. On a wind foil you can also turn both ways and flag the sail or use the power of the sail to drive through the carves. IMO if you like that wave sailing feel powering though carves windfoiling is closer to the same while that pure surfing feeling is closer to wing foiling.
As you can appreciate the strength/direction of the wind and speed of the swell impacts how the apparent wind effects the rider when on the wave more than windsurfing. If the wind is lighter and the swell bigger/faster, then going down the line causes back winding problems for those bigger sails/wings. With a sail sheeting in, like on a bottom turn, helps; with a wing holding a 6m out of the way is bit of a bother. If the wind is more over the back of the wave getting backwinded coming up the swell toeside is likely easier to deal with on a wing. I believe these are some of the reasons why we see most foilers carving back and forth rather than going down the line like windsurfers or surfers.
Also when I go down in a breaking wave I like that I separate from my kit and/or can usually water start quickly.
So like Mr Love said there are all many pros and cons with wing vs sail but I think they are all sort of
minor; and many have fun on both. It really comes down to what you like to do.