At the moment I use:
D'Addario Flatwound 45-100 on my fretless 4 string bass
D'Addario Pro Steels 45-105 on my Ibanez ATK
D'Addario XL Nickel 45-145 on my Ibanez SR 5 string bass
I tried pyramid black (found it horrible, simply the bass was completely dead and unusable), elixir (too much slippery feel) and dunlop...talking about the last... some years ago those strings were so good (especially the SS ones) but in the last years I found a drop in quality so I came back to d'addario.
D'Addario Flatwound 45-100 on my fretless 4 string bass
D'Addario Pro Steels 45-105 on my Ibanez ATK
D'Addario XL Nickel 45-145 on my Ibanez SR 5 string bass
I tried pyramid black (found it horrible, simply the bass was completely dead and unusable), elixir (too much slippery feel) and dunlop...talking about the last... some years ago those strings were so good (especially the SS ones) but in the last years I found a drop in quality so I came back to d'addario.