RotoSound Tru Bass 88 - Boom, chicka boom!
I admire you. I always thought I should like Tru Bass, and I tried them on and off for about 25 years on so many basses. Always hated them. A few months ago on a visit to London I very briefly tried a fretless semi with them and it sounded pretty fantastic.
Whatever you do, don't unwrap them. They're the bloody roughest roundwounds underneath you will ever come across!
All my basses have always had roundwound strings on them, and after quite a few years I settled on Guild Lights (or extra lights ... it was a while ago). Fender put a stop to that so now it's D'Addario EXL220s. I love 'em. 40-60-75-95.
Recently had to restring my Longhorn, and the only short scale strings that seem to be available here are Fender 5250xl strings (40-60-75-95

). I was dubious as hell ... but put them on and they're fantastic. Dano players take note (or not, YMMV).
I also had a set of La Bella flats on my Hagstrom Viking for a week recently, which was pretty much the first time I've had flats on a bass for more than 10 minutes, and it sounded very sweet.
I could see the attraction, but it's got (cut-down, can't find any medium scale strings) EXL220s on it now, and I'm happy. (Medium scale string in Thailand? Are you mad?)
Whatever, I guess I'm a roundwound guy. With a plectrum. And lots of heel on the bridge.