Alright so I am mainly a euphonium player. I played sousaphone for sometime in my high school marching band. Now I'm in college and minoring in music. I have an old 3 valve holton that plays beautifully but I have wanted a 4 valve instrument for a few years now and finally have some extra money to spend. I play sousaphone occasionally in a pep band, however that is only when the other sousa player isn't there and their sousa is available to me. I have also wanted to buy a sousaphone for some time. I have little interest in a traditional tuba. So my question is should I buy a sousaphone or a 4 valve euphonium? Either way I plan to keep my holton. I hopefully will keep the horn I buy for the rest of my life.