SMTP: Mailgun vs elasticemail?

I already had an account at elasticemail therefor my forum is setup with elasticemail. I had 2 dollars on my account, but when I have used them I wonder Mailgun vs elasticemail?

In the setting I can see a special one for Mailgun.

What do you recommend? What is best?

II hope you can tell me if I should change to Mailgun or not?