As mentioned I really like bass builders who make more than just the ‘chassis’ and bolt bought in components to them (simplifying it slightly). For me the top makers are the ones who make bespoke pickups, hardware and circuits themselves, or at least work with companies who make them for the builder specifically.
I also value above a lot of other factors some innovation. So that rules out most people making jazz bass clones. I think a top maker has their own design language and has a no compromise approach, making something idiosyncratic that might not sell in high volume but is the result of a no compromise way of approaching the instrument.
So I’m going to say the likes of Vigier (carbon pioneer, weird and proprietary electronics, individual shape) and Smith (own shape, pioneered the whole game, impeccable build and instantly recognisable sound) because that’s what I own and I’m biased. hehe