I am far too lazy to have to re-tune my bass every time I pick it up (especially as often I only get a few minutes a day) so - much as I think Olivs have the nicest tone of any string I've played - I have tonight gone back to the old stalwarts, Spirocore Mittels. They sound good, hold their tuning well and last for years.
I did recently have some Velvet Blues on my bass for a week or so's try-out, and these have a nice slightly guttier/darker tone (albeit brighter than the Animas and Garbos I have tried). I also tried some Presto Nylon LIghts this week, but they were a bit too dark sounding and 'clunky' feeling. So this evening I re-installed my set of Spiros in one of those I-feel-like-swapping-my-strings-over moments and very quickly was reminded why Spiros are such an industry standard.
Think I am going to stick with Spiros and keep the Velvet Blues in reserve in case I need something darker sounding at some point (plus they are very quickly installed, with their unusual string-type endings, so can sit in my gig-bag just in case I break a string - which may happen on the twelfth of never )