The main advantage of oppo f1s is it has 3 independent card slots,
you can expand its memory up to 128GB you can use 2 sim card and 1 SD card at the same time, which in other device you only can either insert SIM cad or SD card.
It has aluminium alloy body for better heat dissipation, if your phone is heating then it will runs very slow and lag, with metal body your phone will dissipate the heat easily so it will run fast and not lag, and longer life of the internal components.
The protection glass is corning gorilla glass 4 no other brand is giving such specification . corning gorilla glass 4 is 2 times stronger than gorilla glass 3.
oppo f1s is 16MP selfie expert, without any doubt, Oppo camera phone is the best in selfie.
It has a flash fingerprint unlock in 0.22 seconds and you can sync 5 fingers for 5 applications.
Oppo f1s using screen flash and others using led flash, Oppo is the patent owner of this technology, the light is more balanced and softer and will not flash your eyes and will not expose your make-ups.
So Oppo f1s is the best in this category.