Most suitable ROM and Launcher for senior or elder people, Help please.

Hello guys, i am going to give my i9500 to my grandmother so i need to find the most smoothest and simplest rom and launcher for her. She will use only Facebook, Calls, Messaging, E-mail and Whatsapp i guess. She doesn't need any other features. So in the light of these information i need suggestions about Which rom and launcher.

Prism v16?
Ale95 v3.5?
MBP v4?
Doctors v3?
Stock ROM?

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