That's a personal decision you'll have to make for yourself. I was advised to take a year out due to mental health by my college, GP and therapist and I went and all ended well. I have no idea whether it was the best decision as my first 1.5 years or so were an absolute mess mental health wise and I really struggled to cope but I may have fared even worse at home - who knows?
A few things to consider:
1. Unis really want you to pass and finish the course so they will offer you deadline extensions, leaves of absence, exam conditions etc all to try and help you get through the course. Your tutors are likely to be helpful if you need help catching up and you will have a disability coordinator who can speak to people for you if you need it.
2. You could also apply for disabled students allowance which could get you things like tape recorded lectures and a study mentor. Also potentially more money to get a suitable room and other things.
3. a change of scenery can be really good for your mental health and prompt you to make some changes
4. you could have different therapists and a new care team which could help you
5. sometimes a big motivator e.g. new friends, passing your course can help you motivate yourself with your mental health
on the other hand...
1. you will have no one monitoring you initially for crisis points or checking you eat/sleep/etc - this can send some people off the rails
2. you have the opportunty for some very destructive behaviour e.g. drink, drugs, sex, spending with no consequences or judgement because everyone is being irresponsible to a degree
3. you will have a huge change to cope with and new friends to make and a new course/challenge academically - this can send you over the edge if you don't cope
4. uni can be super lonely if you struggle to make friends
5. sometimes it's worth taking the time out so you can actualy enjoy and appreciate the uni experience rather than desparately clinging to the edge of sanity and scraping through