I really enjoyed Hell Warden Higuma. I think the hand gimmick is brilliant and such a good idea that it can carry the series alone for a while in the beginning. I want to see where the story goes.
I did read the first two Ne0 chapters. I think it's decent so far, but I don't love it. Overall, I'd say it's nicely put together as a manga, but the hacking part bothers me the most. The hacking isn't really that well explained and it just comes off as magic hacking abilities. At the same time, the hacking "powers" haven't been too over the top, so I'm willing to accept what happened so far.
I've talked about Chainsaw Man before. I think it's great, the thing I love the most about it is how atmospheric it is because of the cinematic paneling. The blend of highly detailed backgrounds with more sketched out human interactions creates a really nice visual contrast.
I'd say this is the best batch of new series we've had in a while, all three of these could stick around if everything goes well.