4 and 6 very much the same for me, in the current state. 6 especially after going back to replay original Subnautica - it feels so expansive, there's so much sense of going deeper as you get further along. I thought another factor there is that because your starting area in BZ only has one broad direction to go, since the 180 degrees behind you are cut off; rather than landing smack in the middle of the map. That reduces the sense of scale/exploration/uncertainty. But I also feel like this could be an early access thing and could radically change before release when more biomes get added. There's definitely a lot of flat blocks currently.

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I dislike the on-land mechanics - walking and Snowfox - and really hope they get improved. Especially how the Snowfox wants to flip everytime you brush a wall. It needs some even basic auto-parkour. If I'm pressing the forward button, I want to go forward, not bounce around in any other direction.