Using e-Newsletter and Subscribe-by-email

I have a client that wants to implement a basic bulk e-mail system to an imported csv list.

I set up Subscribe-by-email and ran some tests - and got it to work by setting the email to a particular category.

However - the e-Newsletter plugin caught my eye as well.

I haven't tried to set it up successfully yet though.

Do the e-Newsletter and Subscribe-by-email plugins work well together?

Are they meant to complement each other - or would it be an either/or scenario

*I'm just asking because the contact manger seems similar - and I don't see a way to keep the data synchronized.

What would you advise?