I'd play the 2021 UE remake unless you are specifically a fan of retro gaming / have fond memories of playing games in the 90s. If you are new to the series, it hews close enough to the original that you aren't missing anything on puzzles or story, but its modern graphics and fully explorable world might give you an experience similar to what it was like to play the original closer to release.

Then go play the Riven remake. They simplified a few puzzles maybe a bit too much, but otherwise it's fantastic.