Having done both A levels and a BTEC in health and social care, I'd say go for the BTEC. It's a lot of work, but it's much more focused on the stuff you need to know in the workplace. I work in adult's social care as a senior support worker, and I find it invaluable. I use what I've learned daily. You learn a lot about how to work in a health and social care environment. You also do a placement which will help enormously come personal statement time.