They are more similar than they are different. Vein is the direction I had hoped TFP was going around Alpha 16 but they took a hard left and leaned into the arcade looter shooter. Vein is more of an immersive sim. The voxel aspect doesn't matter anymore in my opinion. It used to, back before zombies could dig. Plus they shortened the depth to bedrock, so I think it's irrelevant now. The only reason I ever dig in 7D2D is because I need resources, and if I could get it somewhere else I would. As far as I'm concerned, whichever of these games can do a better job with multiplayer will win out for me. TFP stopped with 8 players which to me is not nearly enough. Vein probably wont be able to do any better. I play with my wife and vastly prefer Vein to 7D2D for a solo/coop experience. The trader/quest loop in 7D2D really sucked the life out of it for us. That being said, when it comes to multiplayer, 7D2D is still a great horde night experience with a group, and building can be fun if that's your thing. I used to like building but I'm really over it now. TFP updates so often that the multiplayer servers wipe and I have to rebuild again. It's old now. Cult of the new? Maybe, but 7D2D has been old for several years now. And they keep doing things that make me want to play even less. Just look at how much development time and resources they lost by coming up with the frostclaw and plague spitter just to make 2 more models to replace them. And they had a cowboy zombie that they already removed. They could have just buffed the lumberjack for the snow biome. Wasted time. And its not the first time theyve done something like this, or even the fifth for that matter. It seems like busy work to me, rather than thoughtful development.