https://wordpress.org/plugins/jetpack/ is quite popular because anyone coming from wordpress.com to wordpress.org self-installed versions will likely pick it up as it is what’s built-in to wordpress.com sites.
It’s also made officially by WordPress so comes pre-installed in a lot of setups like Internet Explorer on Windows machines.
You’re welcome to use whatever you like of course and by all means it might be a great plugin for your use, but in our experience it’s an unnecessarily complicated plugin and has been the cause of many many conflicts over many support tickets over the years.
For subscribers, we recommend:
https://wordpress.org/plugins/subscribe2/
Never run into a problem with it yet.
As for https://wordpress.org/plugins/email-subscribers/, not familiar with it. You’ll want to post here for support:
http://wordpress.org/support/plugin/email-subscribers
Thank you.