Most people studying actuarial don't end up becoming actuaries, even if they way to. The number of actuarial analyst positions at insurance companies is very small compared to the number of candidates. You have Macquarie and UNSW pumping out 200 actuarial students each year, and each insurance company takes around 3-4 actuarial students. Even at the big 4 in actuarial consultig, the majority taken end up being co op students from Unsw.
The cadetship I am doing right now in general insurance only took in 2 students. So you can imagine how difficult it is to become an actuary at an instance company. That's not to say actuarial is a bad degree, it's just that you shouldn't go into actuarial expecting to end up as an actuary in an insurance company. Many actuarial students end up in finance, whether it be IB or S&T, which may be a "sexier" industry for most students.
Personally, I would have done engineering simply because it gives great problem solving skills. Also the requirement of. 3 month internship to graduate (at Unsw at least!) means you build your work experience while you study.
Engineering also seems to be more interesting, for me at least. Actuarial is a basically studying statistics, and at Unsw is taught rather poorly. That's not to say that there arent good lecturers, it's just that alot of them aren't very good at teaching.
Also, have you considered doing both? It gives you the option of getting a taste of each, to see where you fit in the most.