IMHO Wingfoiling on a swell/small wave with the wing flagged and Windfoiling on a swell are both a lot of fun. I believe on a Wing you get more of a pure "surf" feel using only the power of the swell while on a WF I enjoy using the both power of the wind and swell to turn the board or have something to hang onto when carving heel side.
Some of my thoughts/back ground are:
I have only been trying WWF maybe 50 times over a couple of years, so not really any good, while most of the wingers I ride with in Maui do it 300+ times a year. And less than 5% of them can ride like Keahi, although that's still a big number here.
Wingers generally depower when transitioning while I like to power on when jibing or carving. Neither is better just different types of fun. Hence unlike the video Villo Vid I like to have enough wind to easily water start, otherwise there is too little power in the sail when doing the downwind heel carve to really hang on the sail. While the wingers want the smallest wing possible to get up on so its easier to flag.
What I am discussing is riding an on shore reef swell (Not on the steepest part of wave) with side on wind. When on the swell I usually start riding the swell up wind doing one 180 degree toeside "jibe" then pick up the swell for one 180 degree heel side carve. Then repeat. Similar pattern to the wingers.
I am only good enough to link 4 or so hard carves on a face before I move ahead of the swell. Probably because I don't turn back up the face enough when going down the line. However I can float on a swell forever with smaller gentler turns and turning on the sail power only rarely.
Why I do it, I love the G force feeling of carving powered up with the addition power of coming down hill off a swell, (a head high swell is plenty big and gives both the speed of the swell plus the speed of going down hill). This applies both to heel side and toe side. On heel side you can hang on the sail while on toe side its like a powered up jibe with the extra boost from the swell.
So Hilly if you mean sheeting in and hanging on a sail to cave an aggressive turn on a Windfoil is more work than snapping your knees on a Wing then I agree. However when I waterstart my windfoil quickly and ride 3 swells before my winger friends can find a gust to get going on I would say that looks like much harder work to me
)
. Still makes those mushy 2-3ft days feel like wave sailing maui on a mast high day. 
