Oreo introduced features that the J2 never had out of the box:
The Samsung Galaxy J2 (SM-J200G) is a budget-friendly smartphone that was released in 2015. At the time of its release, it ran on Android 5.1 Lollipop. However, with the passage of time, newer versions of Android have been released, including Android Oreo. In this article, we'll explore whether Android Oreo is better for the Galaxy J2 (SM-J200G) and what benefits it brings. android oreo for galaxy j2 smj200g better
If you manage to install a stable Oreo-based custom ROM, you gain features that were specifically optimized for devices with 1GB of RAM, like the J2: Storage Efficiency: Oreo (Go Edition) provides up to 2x more available storage out of the box compared to older versions. Apps are optimized to open up to 15% faster Battery Management: Oreo introduced features that the J2 never had