Filco best OEM with costar stab. Only custom better than filco.

lol! i guess they really think hard to make a keyboard to be self-adaptive to each individual. however keystone might be more useful for professionals.
it depends on your preference. if you liked tactile switches, it might be ok.

compared to filco, the obvious difference imo is filco uses costar stabilizers for large keys. in terms of commercial boards, large keys usually feel better with costar stabilizers than cherry style stabilizers. additionally, costar stabilizers can be maintained or replaced easily.