I think one-man bands are so much more worthwhile, unless you have a lot of money to burn and/or you feel the need to impress those in attendance. Most people just want the music to be leibedik (but, honestly, not too crazy loud…).
The only thing about a one-man band that I would say is to make sure that he is leibedik.
I actually go to chasunahs and take note of one-man bands that I like, so I have an idea of who I would want to sing at my chasunah someday.