the majority of nurses I know are EN's, then become RN's.
If i were to do nursing, i would become an EN first, learn some, do some work etc, then go into uni as a mature age student and do the RN.
That way, one would already have experiance as a nurse, and it wont be so hard and so much of a shock when working in a hospital for practice.
What if you do your RN and then decide you dont like nursing?
Its your choice, but I reackon doing your En first would be a bit easier, and will give more of an insight as to what nursing is.