I have an H2, H4 (bat wing), and Infinity 84. I am using them for SUP foil, but have tried the H2 and H4 kiting too. The Infinity wing pops up onto foil in anything, it becomes a little challenging for me to keep it in the water with waves bigger than waist high. So I think it would be only useful kiting in the lightest of winds. The 76 is more an all-rounder ... it is SS main surfing wing now and would probably kite well in light winds. It is known for having a surprisingly good high end speed for its size. H2 was the main surfing wing last year, but is now specified for larger waves or for kiting. I have kited this wing, locks in nicely, holds its speed well, feels nice and solid underfoot.
H4 is an odd one. It has lower start speed and lower top speed than both the H2 and 76 wings, making it not very versatile. With an extreme gull wing shape, it really wants to turn. Behind my boat, it felt very unstable; haven't used it surfing. I have tried it kiting a few times and it was really fun, slow and carvey. My surf quiver is now the H2 and 84, but I think I'll keep the H4 for kiting capabilities. [a side opinion: I tend towards the cynical on such things, but the H2/H4 combo were slingshot's main surf offerings in 2017 when introduced; now the H4 is marketed at kiting; I kinda wonder if the surf focus ended up as a design failure, with the kiting aspect a happy accident]