In my view, Epic should easily top Hollywood Studios opening day.
For comparable experiences:
DHS | Epic |
Rise | Potter |
ToT | Monsters |
MMRR | MK |
Slinky | Isle of Berk Coaster |
Alien Swirling Saucers | Isle of Berk Flat |
Rockin Rollercoaster | Star Dust Racers |
Then for Smugglers Run, TSMM, and Star Tours, Epic has the Donkey Kong coaster, Isle of Berk boats, Yoshi, Monsters Coaster, and the hub Carousel. I’d say that’s a more than fair 3-5 trade.
Then for shows, HWS has Mermaid, Muppet Vision, Disney Jr. Mickey Shorts, and Fantasmic. Epic will have a night show (probably), dragon theater show, and Potter show. The potter and dragons show should be better than everything DHS has barring Fantasmic.
This is before considering streemosphere and atmospheric upgrades Epic will have over the often ill-contrived DHS.
You’re welcome to temper your expectations on Epic, but really should be the most impressive opening day park since Epcot, and should be able to compete and beat current “world-class” Orlando parks.