I personally prefer Subspace a tad more for its story and platforming gameplay. However, I REALLY enjoyed World of Light, especially the second half. I love that they're both very different, which makes them special in their own ways.
For me, there's certain things one does better than the other. For instance, Subspace had a much better story, and the character interactions were the best! However, many of Subspace's worlds felt bland and uninspired, while World of Light has a lot more variety, and contains areas that are faithful homages to certain franchises (DK Island, Street Fighter, Castlevania, etc).
One thing's for sure though: both have really cool bosses. The boss fight against Galeem is a personal favorite. Love the fight and the music!
