Textra for sure! Although at this moment I'm still giving the stock app a shot, it's night and day over my Note 4. But I do miss the simplicity and theme options on textra (stock is close, but not quite the same). Quick reply is a godsend, I love having the pop-up without having to exit my current app. At a couple points in time I had issues sending pictures or any MMS on it and tried everything under the sun to fix it that I could find, but eventually it fixed itself. The constant updates are nice as well. It's super simple, super fast, I'll probably switch to it after this reply ha!
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