Popup Ads

Which plugin is the best to use for ads.I download both plugins. I want a welcome ad when ppl enter my site (like the Sumome Welcome Mat). Also which one do I use for exits that I can ad to individual blog post.

I also have mail chimp, they have forms also.

Idk which one is the best to use of they are different. Also how do I integrate mailchimp to my email service on here (not sure if the wording is right; sry).

Thanks,
Jenjer