Follow your heart Lodi both phones are good, but with iPhone 6 is expensive(Brand new) pero hindi ka magsisi(Matibay, Maganda, Mabilis at Mamatagalang) however madali ma lowbat(5hours + into gaming).
Xiaomi Redmi Note 5 AI which is cheap at hindi ka naman magsisi sa SD 636 kapag ma taas yung phone memory mo at matagal ma lowbat, but if you phone drops around 5 - 6 feet Goodluck even you have hard case + Shock proof ay hindi ma sira yung screen.
Android is a Friendly user.