Need stable rom for wife topic

I am going to be giving my S4 with MDL firmware to my wife. I want her to be able to have a most stable build and no issues. I am considering just flashing back to stock, but I just wanted to make sure I can keep MDL and not flash an upgraded version...or maybe she'd be happier with an updated stock rom, as she really will have no need for custom roms unless it was going to be a perfectly clean,stable interface.

Wondering what opinions anyone might have?

Thank you!

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