Definitely seconding The Reef, it's so good and I've spent far too much time playing just... just awful maps. You know how I often I load up this game, see Scorch Gorge/Eeltail Zones and say "ok, guess i... won't play... wait what's in X Battle? Hagglefish/Flounder TC? i gotta go"
BUT, if The Reef is in, I'd love for Urchin Underpass to come back with it. They got all the Salmon Run stages I think they should've gotten, and my favorite stage is Moray Towers, but uhh... i don't think they need to touch that one, it's ok