I have a Z10 and always been a BlackBerry user. With the BlackBerry Z10 (Q10) you get what's called BlackBerry Balance which allows you to do business and play without having them interfere with each other.
Iphone and Samsung are both have a better qualities and better features also become very popular among the people now in market both have a computation besides many others companies also launching their brands in the market but in short all depends on the demand and likeness.
Now I have Redmi Note 4, but if I had money, I would take Oneplus 6t for myself. It`s great. And if I had such a valuable phone, I would be more afraid of losing him, and more worried about his safety. Therefore, I attended to this issue and found an interesting site!. I can find there help with finding my phone if I lose it or I just can’t find it, it works with all models and OS and it's completely free!