Go and sit in with with all three disciplines (approach as well, you may go there after aerodrome.) That way you are getting an unbiased view of them for yourself, and also showing the instructors that you have an interest, which can only be a positive thing when it come to choosing who goes where.
Don't be shy, there is no prior booking required, just turn up and ask either a student or an instructor if it will be ok to sit in.
Good luck with your decision. Ian.