IB or A-Levels -Medicine, HELP

OK, so I have been breaking my mind lately about which Levels i should apply for. I'm going to year 11 and soon will have to choose six-form and i don't know which levels are better. I want to pursue a medical career and many people say that IB is better since it makes you a well rounded person, getting familiar with the work load and it earns you more UCAS points. Weather when A levels is easier but I really dont know what to do. If i do Ib, will the work load allow me to do volunteering since its kind of necessary. Or in this case should i do A-levels? I am aiming for the top unis such as Oxford, Kings and etc. Did anyone have an experience in this area? Any advice? Please help

For IB i would choose HL: Maths, Chem, Bio SL: Eng,Latin and Psychology

For A-levels i would choose: Maths, Chem, Bio and Psychology