When comparing Mail vs SquareOne, the Slant community recommends Mail for most people. In the question“What are the best e-mail clients for iOS?” Mail is ranked 9th while SquareOne is ranked 14th. The most important reason people chose Mail is:
Mail finally supports Push for Gmail accounts in iOS 11
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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.
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 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.