Re fretless playing, it's all horses for courses of course, but for me, I play fretless and fretted very similarly as opposed to seeing each as needing a specific style/technique/genre - I often use fretless at rehearsal and gigs playing ostensible 'standard' bass parts, and always enjoy when someone says "I didn't realise you were playing fretless" (our keys player being a great example, I'd been playing fretless every week for three months before he noticed), which to my mind is far more of a compliment than producing lots of slides and double stops etc and having people say "I love the sound of fretless bass".