For me I tend to struggle less with scripted speech compared to spontaneous conversations. Its all about practice and just pretending your talking to yourself, once you achieve that mind game with your brain speeches become much easier. Personally giving a speech at school/work is fine (even though I still stutter sometimes) but somehow something like doing a job interview is a huge struggle, perhaps due to the random questions they might ask you or how you have to change up certain parts of your preplanned script based on the flow of the interview. I stuttered like crazy during my last job interview and didn't get the job, for the next interview I will try taking some propranolol and see how that goes for me.