The Samsung Galaxy J2 (SM-J200G) might be an older device, but the custom ROM community continues to breathe new life into it. If you are looking for a smooth, feature-rich, and visually modern experience, Next Gen OS V3.7 is currently one of the top choices for this specific hardware.
Custom Recovery: You must have a custom recovery installed, such as TWRP.
Optimized Performance: Developed to be smoother than stock firmware, with some "Lite" versions available to maximize the 1GB RAM on the J2.