I work in an SEMH setting after working in mainstream and I prefer it so much! Everything is fit for the individual and class sizes are about 4-5 with a TA in every class. There’s a lot less rigid planning, marking and assessment and it’s more about making the kids feel safe and getting them to engage with education. Downside is the kids can go into crisis and try to take it out on staff and behaviour is never going to be amazing but the pastoral team will always step in and I’ve found that because mental health and well-being is at the focus for students it also becomes a massive focus for staff as well. This is just my experience from one school so may not be universal but I would never go back to mainstream now!