The stock J2 runs an older version of TouchWiz. While functional, it is heavy and often lags on 1GB of RAM.
While Oreo has great battery optimization, custom ROMs often lack the specific power-management drivers that Samsung includes in its stock firmware. You might find your battery draining slightly faster on Oreo than on the stock Lollipop ROM. android oreo for galaxy j2 smj200g better
If you install a stable LineageOS 15.1 (Android 8.1) build for the J200G, here is what improves: The stock J2 runs an older version of TouchWiz
Since this is a custom ROM, there is no OTA (Over-the-air) support. You have to manually flash every update using TWRP (Team Win Recovery Project). If you are not tech-savvy, you might brick your device. If you install a stable LineageOS 15
If you manage to install a custom Android Oreo ROM (such as LineageOS 15.1 or Resurrection Remix) on your J2, you will notice significant changes compared to the stock Lollipop or Marshmallow experience.
When developers ported Android 8.1 Oreo to the Spreadtrum SC8830 chipset of the J2, they focused on low-end hardware optimization. Here is why Oreo is a game-changer for the SM-J200G.
Yes, but only if you like tinkering. For daily stability and camera reliability, stick to Marshmallow. For a modern look, better app compatibility, and split-screen, Oreo is a fun upgrade.