>>49214876ORAS butchered New Mauville, Sky Pillar, and Granite Cave, removed Mirage tower, the game corner, and gym leader rematches, added linearity like forcing you to battle Brawly before delivering the letter to Steven, teleporting you to Mauville city after you get surf instead of allowing you to explore the optional water areas around the south west of Hoenn, not allowing you to skip Winoa and go straight to the safari zone and past if you want but forcing you to fight Winoa when it wants, shoehorning in gifting you Latios, and it made the game far easier. Just see for yourself the difference between the gym leaders.
https://www.serebii.net/emerald/gym.shtmlhttps://serebii.net/omegarubyalphasapphire/gyms.shtmlEmerald also runs faster than ORAS. ORAS does add positives but it doesn't outweigh the negatives.