Ask HN: Mailgun or Mailchimp for paid newsletter?

I'm trying to set up a paid newsletter featuring more in-depth content for my blog's subscribers (assets, source code, tutorials, etc.) and wondering what third-party services to use. I currently use Mailgun for transactional emails and love it, but I'm not sure how to configure it with recurring subscription payments. Mailchimp would require switching horses, but is designed more to work with newsletters and has a few plugins specifically for paid content. Does anyone have experience with either service or paid newsletters in general? Has anyone configured a setup that uses both? Is that even a possibility?