For a modern jazz sound and extreme reliability, I'd wager Spiro Mitts are a top choice. I haven't done a lot of experimenting, but I can give my two cents.
I started on Spiro weichs on my Chadwick, but hated the sound and size of the G.
I tried Zyex Med next. First the G, then adding the A and D. I really liked the feel and sound of them, and they were quite loud. I had breakage issues with a fairly rigorous touring schedule though. Not fun. (And yes, I had the bridge and nut slots done by my luthier to accommodate the bigger D and G.) I always kept the Weich E on. I just couldn't rely on them, so I started looking around.
Jake at The Bass Spa recommended I try the Innovation Braided (I am one of those guys that likes them), as an option. They came up to pitch easily and didn't stretch anywhere near as much the Zyex. They reacted much like the steels in tuning stability, etc. I had a busy touring schedule and they easily handled the repeated set-up/tear-down process (well over a hundred times). The wrap stayed in place and they seemed to retain their tone throughout. I've had the 140b E on and off with the Spiro Weich, it's hard to get a lot out of the E on a ply, IME.
If pizzed at the end of the fingerboard, to me, they have a lot of life, and a bunch of fundamental. They do lack all the overtones of the Spiro set, but I like the simpler harmonic series. A nice pop and the front of the note and a solid fundamental is more my style. I play mostly honky tonk and roots stuff, so it's perfect for me. They sound good mic'd up live, or in the studio. And, they're about as loud as the Weichs acoustically.
Good luck.
