My opinion based on playing 5 trumpets over the years:
You can't predict what the sound will be like.
Three of my horns have a single tuning slide brace, one has two braces and the fifth has none. The "brightest" horn has a single brace, the "darkest" (and actually most versatile for me - it lights up when I want it to) has no brace, and the double-brace horn is closer to the brightest one. The other two single-brace horns are somewhere in the middle.
You should be able to work out which new tuning slide works best for you when you try them. Only then can you know if the new slide will fix whatever you don't like about your current slide.