AAS,RN? or bachelors.... CONFUSING!!

[Enza]

I'm going to be attending Harper Community College in the fall to begin my Pre-Requisites. They essentially gave me two options:

One option would be to attend their school for three years and obtain an AAS and become a RN, by following this path, I am unable to transfer out.

Worst case scenario I go back to school after I complete my three years and obtain my bachelors degree.

Option number two would be that I attend the college to complete my pre-requisites based upon the transfer school's requirements and attend school for about 5 years and obtain my bachelors...

I chose option number one, because they told me that the only different between AAS RN and BSN RN is the ability to be promoted in the field, so for example, to become a head nurse...

Is this true?

What is the difference between the two degrees?

my plan is to become an ER nurse.. will I be able to follow through on my dream with the option I chose?

Thank you for your help! I'm just a newbie and this is all very confusing to me!

Enza