I have been using Mac OS Mail app for a few days now.
Its light, simple and fast!
I followed this blog post to get going
http://mac.appstorm.net/how-to/internet-howto/turning-mail-app-into-the-best-mac-email-app/

Although, i would like to point out that smart mailboxes dont work / cant be accessed on iOS.
So i have used folders instead and have created custom keyboard shortcuts to move messages to folders from my inbox.

Have u tried Mail app over outlook ? How was your experience ?