The latest version of Gmail for the iPhone and iPad has an elegant new design -- closer to that of Google Plus -- and several new features. Some of the improvements merely bring it up-to-date with competitors. Others, such as search, should make you think about switching from Apple's Mail.
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The new version supports multiple Gmail accounts. Some people might find that useful, but I've got all of my various email addresses -- I've got six or seven at this point -- forwarding to one spot, in iOS Mail. iOS does not support multiple accounts, however, so I could see this feature being useful if more than one person uses the same device. Then again, I would get notified about other people's emails.