Well.! SAMSUNG is the brand trusted by billions of people worldwide. Samsung galaxy J2 Ace, My personal experience, is quite disappointed.
The phone has 8MP primary and 5MP front camera. The picture quality is somewhat satisfying not so good.
5-inch capacitive touch screen with 540*940 resolution.
Android 6.0 Marshmallow OS with 1.4 GHz MediaTek chipset with quad-core processor. The performance with normal apps is good but when you start playing high graphical games phone hangs up and processor gets heated.
1.5 GB RAM is what the most disappointing thing in the phone.
8 GB internal memory. 256 GB expandable.
2600mAh battery, again freaking disappointment.