Much less clever and subtle. I would call that a pretty low bar, honestly. Helluva Boss also has a lot of poorly-written content IMO, but in Hazbin it's nonstop bad writing until there's a small glimpse of something competent. I would recommend Helluva Boss to anyone who likes shitposts and sitcoms, but I wouldn't recommend Hazbin to anyone right now.
I liked the hazbin hotel pilot, but very much felt how you do about the helluva boss pilot. I thought hazbin was fun and quirky and I liked it a fair bit, helluva boss cranked up the edginess and immaturity but didn't bring anything else that made up for it. Maybe the actual series is better Idk