I do a bit of both. First bite is just a simple bite. Then I go for the caramel on top, Biting off a chunk of it. Then the bit of biscuit remaining gets eaten. I eat the whole thing in stages like that. Eating off caramel followed by the remaining biscuit. And I always leaves the chocolate on the sides of the biscuit, it makes it nicer.
also recently tried this method on a snickers. Worked like a charm.