I have nickel rounds on my Chi'd Decade, but have flats on my Darkstar'd Glaub. I think you really need to try both.
In anticipation of my Decade coming back, I am trying to decide if I want to keep the flats on or put on rounds. Most of my basses (actually all except my '65 EB-0) have rounds because I like that piano string sound.
But the flats on this one sound great and I like that very smooth feel when you do glissando's and similar technical things---it seems much more comfortable in doing these things as opposed to having rounds on.
I am just looking for some sound (as in "tone") opinions about the Decade, with Darkstars, on flats and rounds on these, and your personal preferences and why you have your preference. Seeing how a set of strings is an expensive proposition, I just don't want to go out and buy some rounds and then decide not to use them, so some personal opinions would be appreciated.