I’ve used G-One Speed in 700×38 but not the tubeless ones – found them pretty good as long it was dry.
Currently using WTB Venture 47 on 650 wheels. Much prefer them and the smaller wheels for all round gravel. The Ventures have tread and therefore I would imagine offer more grip than the Byways in damp conditions and I’ve not had any issues, but, like a lot of tyres are rubbish in proper mud. But I don’t tend to ride through proper mud that much.
My caveat though, used the different tyres on different bikes – G-ones on farily heavy Boradman ADV8.9 and the Ventures on much lighter Vitus Substance with carbon wheels.
For anything with off-road sections much prefer the smaller wheels – more nimble, quick acceleration etc. Also my times are the same if not quicker on road sections than on the G-ones, but obviously a lighter bike. Slower than road bike though.
Like Jameso, I’ve settled on 650B for gravel and a separate dedicated road bike.
My original plan was to get a second set of 700c wheels, but don’t really see the need now.