I'm partial to Parallax. The skybox can be changed to almost anything and I don't have to worry about running into natural terrain or bumping into the kill barriers. There's also plenty of room to work with assets and scratch builds without creating an additional file.
Yeah I think I'm going to parallax for the next map. I've done alpine twice & I have a layout on glacier. Parallax seems to be pretty adaptable.
Parallax. Alpine and Glacier's terrain are pretty useless, there's no really forge able areas like we've had in sandbox and forge world. The water on alpine is great but fairly small and ruins an grass you'd want to put in the map. Paralax is versatile, and though it would be nice to have preset terrain and backdrops, the others are so bad that it's not worth it.
I love Parallax for it's wide open space and sky boxes. Don't get me wrong. I love the others too. However, I like to build small 4v4 maps and the other canvases are best for open, BTB maps in my opinion. I'm still looking for a forge world remake from Reach. It'll be the first time a forge canvas had it's own remake in a Halo game.