Community and inpatient both have their own joys and challenges.
Inpatient is usually shifts and 24 hour service which can be a bit of a work life balance nightmare depending on staffing levels, who does your rota and what else you are juggling. But the upside is there is always someone around to ask if you are unsure, an HCA, another nurse, a manager, someone who will be physically not far away you can talk things through with or who can stand next to you if you feel like things are a bit risky or swap with you maybe if the situation calls for it. The wards are often busy and breaks can be hard to prioritise but having a good team is great, when you go home you know someone else is looking after everyone, although you might still worry what tomorrow will bring.
Community is more often 9-5, often you can manage your own diary a bit so plan your day the way your prefer as long as you fit everything in (some things like meetings don't move). You hold your own caseload and are responsible for your own clients building relationships with them. It can be really lovely going for a coffee with a client and taking the time to have a chat 1:1. You don't get the same 1:1 time in the wards. The downside is you carry a lot of risk. While there is a team / duty worker etc. you are often depending on your client to pick up the phone and seek help if things get bad or for you to recognise signs of things getting worse before they need to. You don't have anyone really to hand over to at the end of shift (maybe forwarn crisis they might get a call but it's not that same as knowing someone has staff there all night)it can be a worry and getting the balance between letting someone get on with their life, accepting that some symptoms happen and keeping people safe is a difficult thing (have to consider capacity too as well as mental health). Often you wear a lot of hats in community, part nurse, part social worker, part advocate etc.
There are some jobs, things like home based treatment teams which are a bit in the middle and some jobs that fit in really different roles (therapy or mental health navigators, admiral nurses, psych liaison, transition of care nurses) mental health nursing is fabulous and varied (and at times stressful and infuriating- systems not people). There is too much paperwork and not enough staff in all settings but that is the way of the world!
Good luck with the interview and whatever path you take.