Buggy bags are quite heavy due to the material they use. Good build quality but heavy.
Revelate excellent quality but no longer make “custom” frame bags, and import duty.
Alpkit are good quality build, decent materials. Looking at the first production version it could do with a couple more velcro straps for attaching to the frame and maybe a waterproof zip.
Wildcat tick every box for me, light, excellent quality build, good comms, custom, quick. Slightly more expensive than some of the others but has been thought out meticulously.
Bikepack eu make good stuff but no frame bags.
Not seen any of the rest of the competition on Chimps list.