Sendblaster VS Atomic Mail Sender

If anyone here has used the two can you post which one you think is better.

They both seem to have the same features. I'm looking at the demo for each one but would like to know if one is faster than the other when it comes to using the paid version using an external SMTP instead of its direct send feature.

I'm sure the speed of it will depend heavily on the SMTP server you use but lets say for example I were to use the same exact dedicated server, would one be faster than the other?

Thanks

Also how does MailerKing fair against these two? (using an SMTP server not webmailing)

Send Blaster I think is the best, though I haven't tried the other ones. But send blaster is pretty good.