When comparing MyMail vs SquareOne, the Slant community recommends MyMail for most people. In the question“What are the best e-mail clients for iOS?” MyMail is ranked 10th while SquareOne is ranked 14th. The most important reason people chose MyMail is:
My.com account allows storing up to 150gb of emails.
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 It's possible to get notified of only important messages
Once incoming messages are grouped into zones, it's possible to mute certain zones so that they don't show push notifications.
Pro Can automatically group incoming messages to help manage them
SquareOne allows setting up "zones" that will automatically pull incoming messages from set contacts. This allows you to focus on one group at a time. For example, a work group during work time and a friends and family group once you're home.
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.