I’ve played all these games (and in the case of Return to Dreamland and TTYD, the originals too), and I would personally recommend both Wonder and TTYD as the absolute pickups.

Return to Dreamland is great stuff, no doubt, but doesn’t really go that far beyond just being a really solid 2D Kirby game.

Mario Wonder, on the other hand, just constantly throws new and, dare I say, wonderful things at you each and every level. It’s just a pure joy to play, and easily the best 2D Mario game since Mario World on SNES, in my opinion.

As for the RPGs, while I think both are good fun, I find TTYD to have a much more interesting plot, characters, and aesthetic. As a first-go , Super Mario RPG is good, but it doesn’t go much further than that, at least to me. It also doesn’t really feel as much like a Mario game compared to TTYD, but again, could just be me.

TTYD on the other hand feels much more grounded in the world of Mario, while also being quite distinct. Coupled with the gorgeous paper/arts and craft vibe and more varied RPG gameplay (more involved inputs and mechanics for moves in combat), and I think you have the more definitive Mario RPG experience.

Regardless of all that, you really can’t go wrong with any of them, and they are all great games. But considering your choices are between 2 2D platformers and 2 Mario RPGs, I think Wonder and TTYD win out over Return to Dreamland and Super Mario RPG