One of my most favourite wing boards is a One SUP foil board 5'10" x 27.5" 107 ltr. It's super light. Super stable. Goes fast on the surface. Good fun on the wing.
I've got back into it recently chasing lighter winds and seeing if I can match downwind boards. I sort of can using a big wing and a fast high aspect foil.
The only negative is the handle is in the deck, no handle on the bottom. I need to make two trips to get wing and board onto the beach. Once on the beach I can carry both together using various methods.
My 5' board has the bottom handle and is a bit shorter so I can easily carry it and a wing wherever. It's about the same weight as the 5'10".
If you want to go super crossover I am selling a 7'8" Sunova 2in1 SUP surf/foil/wing board. The ad is here:
www.seabreeze.com.au/Link/Ama_dc