It's great that the school offers services for free, but with that you're getting a mixed bag in terms of effectiveness, and you know for sure that you're getting clinicians with no experience. This isn't necessarily a bad thing with them being supervised, as you mentioned, but it's impossible to know (for example) how empathetic they'll be or how much they know about stuttering. There's a chance they've hardly learned a thing about stuttering and you'll be the first person who stutters that they've ever encountered. Or they may already be well versed in stuttering. You may want to just try it out for a few sessions and see how it goes. One potential indication of the quality of therapy you'll get is whether the university has a faculty member who conducts research on stuttering or specializes in it in some way - if so, this may trickle down to the students. Feel free to DM me if you have more questions! For context, I stutter and am a speech therapist who specializes in stuttering.