Selection between External Sql Server and Internal In VS

Question

Hello,

I have to teach asp.net but what should i choose between External Sql Server Express and Internal in Visual Studio.

I have limited number of classes.

We can cover all basics like create databases, tables, procedures , transactions etc. in Internal VS.

I am asking this for Student (Btech, Mtech, Bca, Mca etc.) purpose only when they need to complete their college project...

Any idea for which i should go...

Thanks in Advance