You can buy the S3 Ultra Edition for another $40 but I wouldn’t recommend that. You can buy xp boosters which are limited time and you can buy KI gold as well.
Personally I dont really care for the classic games, loved them when I was young, but they feel dated now and dont play them at all, have KI 2013 for that.
The extra xp does wonders for me though, since I play regularly, but only a few hours at a time…so levelling everyone still takes forever even with the extra xp.
The gold is awesome too, IF you plan on playing a lot of Shadow Lords and want some great starter pack with Guardians.
I might pick the definitive edition eventually for the soundtrack and extra’s and because it would give me a solid copy, eventhough I really prefer digital games nowadays.
But to me season 3 ultra edition was great.
The only downside is less stages this season, but those editions dont change that.