My hand joints are getting better finally and I wanna learn an instrument. The thing is, I'm dumb and have struggled really badly with reading music in the past.
You don’t need to learn finger combinations like on most brass and woodwinds, nor chords like piano and other string instruments. Just the 7 positions the slide can be at. Blow a raspberry and the note comes out.
Trumpet is similar but a lot easier to store and transport. Also those three valves are pretty much the same amongst other brass instruments like French horn, baritone, tuba, etc. so you can move between instruments if you choose.
Because of the rotary valves and trigger? Or for some other reason?
If that's the only difference you're calling out, it's worth noting rotary valves and triggers show up on other instruments as well. In particular, tubas often have rotary valves, and it's not uncommon to see trigger valves on trombones.
Having played both piston valves and rotary, the difference is negligible.
I think that applies to the others as well, except in some cases when they are tuned to the same fundamental, e.g. Bb Trumpet, BBb Tuba. But tubas commonly come in C, F, and Eb as well (trumpet variants also exist, but are less common).
If it's a short note, it's usually not that dramatic. If it's a long note and you're still playing it, then have no shame in adjusting as soon you hear that it's off.
Generally, though, don't beat yourself up about it while learning. Just make a mental note that you eyeballed too low/high and try to do better next time.