I'm the opposite - I have far more dislike for Mania than 2017
"Dislike" is kind of too strong a word, but the thing is, Mania is a game that tickles my nostalgia, but not so effectively that I'm not aware I'm being tickled. Mania's selling point is "look, 2D Sonic remade!" and...that's it. No story to speak of, nothing new gameplay-wise, it's basically "Nostalgia: The Game." Which is fine, I guess, I have a lot of nostalgia for Sonic, but if nostalgia is your only selling point, don't expect me to be enamored.
Sonic 2017 on the other hand, does strike me as being its own thing. I have no idea how that thing will turn out, but it does at least raise questions (what's the resistance? Has Eggman took over the world? How will it play? Is this possibly set after Sonic Chronicles? Etc.). It's also a personal welcome return to form for me, in that it's a game that seems to be taking itself seriously, but not so seriously that we're in Shadow the Hedgehog territory. Because if anything, the trailer feels like a send-up of past cliches, because as soon as Classic Sonic turns up, the tone does a...well, not so much a 180, but more a 90 degree turn, that genuine stakes remain, but we haven't forgotten that this is a setting of anthropomorphic animals and whatnot. I can enjoy Sonic material that is focused primiarly on comedy (e.g. the Boom cartoon), but there's a reason that SatAM is my favorite Sonic cartoon for instance. I've noticed that the Sonic games have been focusing more and more on camp (Colors, Generations, Lost World, Boom), so something on the level as, say, Sonic Adventure 1/2 would be welcome.
Will 2017 be "good?" No idea. But I get the sense that 2017 is at least trying, while Mania is a cynical attempt at reliving the "good ol days," Green Hill included. Because of course Green Hill is included. Thank you Mania, you've made me resent the presence of Green Hill Zone.