3 devices are very different. Redmi 3 is higher on specs and heating issues. J5 ( 2016) is mid range device, I try to get it, But it was sold out. Anyway I bought On 7 Pro which is a better choice in 10K, it is not an powerful multimedia device, but a true productivity tool with the trust of Samsung. Also loaded it with some great Samsung apps like Focus, Note, Music and Video.
Personally saying if I have not bought On 7 pro, than I would have bought either On 8 Pro with more RAM and ROM or On