Samsung z4 is low end device after using 10 days I faced many problems.
Good thing
1) display is good and good viewing angle.
2) averge battery life
3) camera is quite good
Bad things
1) this phone comes with differnt os due to this very few app are supported in this phone.
2) heating issue
3) if u ran 2, 3 app phone will start laging.
4) 1gb ram and from this hardly you will get 200 to 400mb ram free. Due to this phone takes time to launch any application.
At this price point better go for redmi 4a which comes with many better features than samsung z4 without taking too much pressure go for redmi or moto.