A-levels have exams and occasionally a little bit of coursework. BTECs are all coursework.
You can pick 3 A-levels, and an AS.
BTECs are slightly different. Some BTECs are worth 1 AS, others are worth 3 A-levels. It depends on what your local sixth forms offer.
The advantages of BTECs are that there are no exams, so if you struggle with exams then BTECs are the better choice. However, some universities look down on BTECs, and they could ask for higher equivalents in their conditional offer. The coursework load is also massive - I did a GCSE level BTEC and there was just so much coursework to do, I completely burnt out.
Media, Photography and IT are all available as A-levels and BTECs, however all of the A-levels have huge coursework components anyway. I do A-level Media Studies and the coursework is 50% of the A-level, and it takes a couple of months to complete.