Articleship.............

I have been in selected in SNB for internal audit and in Luthra and luthra for taxation, which firm should I join? Which department has lot of scope for a CA.

Someone told me that Statutory Audit offers lot of scope becuse a person gets an idea of everthing and is an expert in audit, Is it correct?

And SNB is asking for original documents for joining as an article, so should I submit my originals to them if I join them. 

And does Luthra n Luthra allows inter department transfer. Please advise.

Thanks