When comparing MyMail vs Mail, the Slant community recommends Mail for most people. In the question“What are the best Gmail clients for iOS?” Mail is ranked 9th while MyMail is ranked 12th. The most important reason people chose Mail is:
Mail finally supports Push for Gmail accounts in iOS 11
Specs
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Pros
Pro Offers 150gb of email storage
My.com account allows storing up to 150gb of emails.
Pro Intuitive swipes for dealing with messages quickly
This app lets you swipe to mark unread, put message in a folder, mark it for later action, or discard it.
Pro Supports Push in Gmail
Mail finally supports Push for Gmail accounts in iOS 11
Pro Comes pre-installed on all iOS devices
No need to go out and install another app from the App Store.
Pro Integrates with iOS search
You can use spotlight to search through emails.
Cons
Con Caches your passwords even after you uninstall
Their servers may open your mail without you knowing, marking your messages as read without permission.
Con Duplicate notifications
If you still have Gmail installed, you will get a notification from Gmail and MyMail for each message.
Con Some emails on iPad have excess padding
iPad version adds padding to text that can't be overridden and it can mess up the layout of the email.