When I want to adress someone, is it correct to put one's name at the beginning or at the end of the sentence? On different forums when I need to thank someone, what is the best way to say:

Thank you for your answer, Sandy!

or

Sandy, thank you for your answer!

What is more correct?

When I want to adress someone, is it correct to put one's name at the beginning or at the end of the sentence? On different forums when I need to thank someone, what is the best way to say:

Thank you for your answer, Sandy!

or

Sandy, thank you for your answer!

Which is more correct?