Every playing characteristic of the horns you mentioned above is more representative of the player's sound and abilities. The horn itself has none of the characteristics you mention. It only amplifies what is put into it.
If you are a good player, with good tone, and good abilities, you will sound that way on any equipment that is in good condition.
If you suck, well then, you suck...it ain't the horn.
Sure, horns can have certain tendencies which favor a bright or dark sound, but they are not that dramatic. Your individual playing style may have you preferring one type or brand of horn over another, that's fine, doesn't mean the horns you don't like are bad. It only means you don't prefer them.
Sometimes it's popular to bash a certain brand of something because everyone else does it. For awhile, King made the "absolute best" horn, then Kanstul, back in the seventies it was OLDS. Yet plenty of corps got there butts kicked by other corps playing on the horns that were popular to bash at the time.
I know I've tried Kanstul sopranos a couple of times. I don't like them. I don't like them because I prefer something else.
I absolutely love the CONN Vintage One flugelhorn, best flugel I've ever played and I've tried a whole bunch. Lots of people probably don't like it.
I've been in drum corps since 1964 and still play a G bugle, but I've also played trumpet the same amount of time. I don't get complaints when I play drum corps or professionally on the trumpet. Part of that is; I don't blame the horn.