I'm a former samsung user. I really like the "secure folder" feature they offered. Here in Brazil it's common for thieves to force you to hand the phone unlocked to them, so they can totally own bank accounts, credit cards, etc. The secure folder is like a phone within the phone, with separate and isolated apps, hidden and pin protected. Even if a thieve takes your phone away unlocked, he won't be able to access critical stuff.
I'll try to use the "user profiles" suggestion and see how that goes.