Just an opinion from an old journeyman bassist ..... learn to play DB if you really WANT to learn the instrument, not simply for the sake of "getting more gigs". (Of course, that could be a poor example if music is your only income; there have been times I would have played a chain link fence post if it meant I was going to get paid

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I know way too many bassists that are poor DB players with bad technique, bad tone, bad intonation. They would have been far better off playing a slab and sounding good. As stated above, no leader (or sideman) wants to deal with BS, especially once you get past the hobbiest stage of gigging. Appearances are all well and good, but sounding like *** is the worst thing you can do ....
I've been playing DB longer than most of the guys on this forum have been alive, but I also use ERB's and EUB's extensively. The guys in my circle don't care what I walk in with, they trust me to do what will be good for the gig. Lately I have been using a Barker Vertical Bass on almost every jazz date I do and I've never been been taken to task for using the bass .... and on paper, the BVB has everything that all leaders are supposed to hate

. It has a standard EB neck, it's electric, it's "upright" in appearance but does not look like a DB, and in my case, it has 6 strings
BUT, the bass sounds phenominal, has excellent stage presence, sits "well in the mix" (Lord, I hate that stupid phrase), and has a very unique tone that is well suited to the music. AND, from my own self-centered viewpoint, it is an easy load-in/load-out ....
Like I said before, IMO don't get a DB unless you're willing to commit to really learning to be proficient. There is nothing that sounds worse than a poorly played upright
