I have flats on most of my basses, but I like different ones on each.
I have 2 Precision type shorties, one with La Bella DTF and the other with Dunlops. They have the same pickups and loom and sound very different. The DTF are a super deep thumpy sound that I really love. The Dunlops don’t go quite as deep but have a much nicer feel under the fingers.
My Ibby Mezzo basses have Dunlops. The 5 string has stock pickups, the 4 has EMG PJ-X set and a 2 band EQ.
My Sandberg TT4 jazz with EMG J set and a 3 band has Ernie Ball Group iv flats. I’ve tried all the others on this bass and keep coming back to the EB set. They are very bright when new and take an age to dull down unless I do the hand cream thing. They also feel very nice under the fingers and are really versatile. Nice and deep when played gently, nice bit of clank when digging in.