I've owned and played a Tobias Killer B 6 (lacewood with a laminated wenge/purpleheart neck and active Barts and pre) for over 10 years now. I also have a 72 Fender P (ash with a maple neck and factory PUPs).
Entirely different creatures!
The P does what P's do - thump, big time! Roundwounds give it a bit more life, while original type flatwounds stay in tune for ever, but they mostly provide a thump/thud. There are music styles where that is the only thing that is suitable, and I'll never sell my old Fender.
The KB-6 has a quite thunderous B and a clean, clear high C, good sustain, and a wonderfully playable, thin, asymetric neck. The Barts and active pre allow a whole range of tones from slap (the string spacing on the Killer B is a bit tight for slap, it may be better on a 4 or 5 string) to a good jazz tone on the bridge PUP or full, round fingerstyle on the neck, and almost anything in between. But I can't make the Tobias do the P bass thump.
If you're playing in a rock/blues band, then the P might tickle yer fancy, but for jazz/funk and other styles that may require a bit more articulation and definition, the Tobias would be my choice.