I like Talking Bass. Purely because Mark is a straight, no bull, down to business teacher. I find Scott really grating. I don't deny he's probably a great teacher, but I can't stand all the fluff and filler. It's too much about him.
I used to use Justinguitar when I was learning to play the octave higher thing with too many strings. He's a superb teacher and extremely likeable. It's a shame he doesn't cover bass.