I found that fitting Rotosound black flatwound strings give a good DB sound on my EB, nice warm tone with no roundwound rattle, kinder to frets too. However there are some deeply convinced EB haters out there who will never tire of making depracatory remarks about cricket bats and electric sticks.
I use both EB and DB, but I far prefer DB. I can pick it up and play, no pluggin' in and all that stuff, but mostly it is the tone, sustain, warmth, flexibility, and sheer sensual feel of an acoustic instrument that does it for me. Consider the advantage of not needing amplification too, stand there and play with a pianist or a guitarist, see peoples faces light up as they realise you will not doing any harm to their hearing. The 'Underwood' transducer does the business where more whampo is needed and for £2000 or so there are some very nice Chinese basses available, and if you take care of a DB you will find it to be a[ pardon thr terrible pun ] sound investment. Ed.