The Thumb BO with humbuckers sounds just like MM. Every bass does sound different, and the tone is just want individuals percieves. But i am sure the tone of humbuckers will sound like humbuckers, and jazz pu will sound like jazz pu's. if we are talking about "general tones" then it doesn't matter what bass it is, it comes down to the pickups. plus its really a case of 2 pickups verses 1. how limited do you want to be to a tone.
warwick sound better in my opinion than MM, and I own both!!! the MM i use for "dodgy gigs", where i'm more concerned on security than tone. if my MM gets nicked then so what, I'll get another one. but no two warwicks sound exactly the same. so i don't wanna lose my beast.