I will try and comment in a non-biased way
I've never played a Spector but I know they have a very devoted following. They sound really good.
As for Warwick, I've owned 3.
- 1994 Fortress One - great bass, loved the PJ setup. Didn't like the all wenge neck. Neck profile was very similar to my....
- 2008 Corvette $$ 4 - quite simply the best bass I've ever owned. Love the neck (quite chunky but not "baseball bat") love the electronics, love everything about it. Very versatile. The ash body gives a wonderful tone, and makes it quite light weight as well. Prefer the ovangkol neck.
- 2006 Corvette $$ 5 custom shop - As above. Of course, adding an extra string does make the neck a bit thicker but not uncomfortably so. And it's light for a 5, at 9.5lbs. Excellent B string.