(Personal Opinion)
overall this is a Great product, or I can say value for money.
I was looking for good decent phone for myself and Vivo V9 is a life saver I can say. really amazing cool features. really great battery back up.and easy to charge. camera quality is clean and clear and easy to focus.
(Camera)
primary cameras are 16+5 MP dual. with Al face beauty and time lapse photography, live photo, AR stickers, shot refocus, ultra high definition, professional mode, smart motion, palm capture, gender detection, panorama, 4k videos, 24 MP front facing camera.
(Screen)
15.51 centimeters(6.3 inches) full high definition capacity touch screen with 2280*1080 pixels resolution.
(Battery)
3260 mAH lithium-ion battery.
(Memory)
64 GB internal memory, expandable up-to 256 GB and Dual sim(nano+nano).
(Processor)
Android V8.1 Oreo operating system, 2.2GHz snapdragon 626 Octa core processor.
(Warranty)
One Year Manufacture warranty for device and 6 months manufacture warranty for inbox accessories including battery from the date of purchase.