Former guitar player. Strings were rounds but not as coarse as bass strings, and easier to press down.
So I imagine that the first time I touched a bass string (probably a roundwound) I decided that I would like lower tension flats. That was in the distant past.
Before owning a bass I studying here at length, basses and strings, and my own personal collation of all of those opinions led me toward a short scale PJ and La Bella Jamersons (very thick), an extreme combination.
Bought those and observed the sound myself. Liked it, but after a short time those strings started getting "thumpy" and I didn't like that at all, so I studied here the topic of less-thumpy flats.
That led me to Thomastik-Infeld Jazz Flats (TIJF), and my preference has remained with clearer sounding, more flexible flats like that. Also love the thinner La Bella sets, and probably Cobalt flats (which I bought but haven't tried yet).
It is only being a fan of some bass players who used rounds that keeps the possibility of rounds alive with me. I studied "rounds with the least zing" and that led me toward Thomastik-Infeld Jazz Rounds (TIJR). They have remained right at the limit of what I can accept. One set, on a Rickenbacker. Two years old, still very beautiful.
I am frequently playing that bass and almost forgetting that they're rounds and I say to myself "these things are *almost* good enough". Two years now. (Sorry I've told this story before.)
[In this specific regard I didn't like GHS Pressurewound as much, and the Roto version of the same even less. Bought Sunbeams but haven't installed them, as they seem rougher too.]
In conclusion, I set some priorities and searched for the extremes. After experiencing the extremes in some cases I backed off a little.