There's also Pijul. I have only had a brief play with Jujutsu and I haven't tried Sapling but from what I can see, Jujutsu is definitely the best option if you want to actually get stuff done while mostly maintaining Git compatibility.
Pijul is definitely still in the research prototype phase, and definitely not Git compatible. I don't know how Git compatible Sapling is, but large parts of it are still labelled "Not yet supported publicly, OSS is buildable for unsupported experimentation." It also feels like a VCS that was designed for Facebook and then open sourced, so it is targeted at the use case of "massive company monorepo, and we have 10 guys that run the infra". That's great, because Git is bad at that use case, but it might not be what you want.
Pijul is definitely still in the research prototype phase, and definitely not Git compatible. I don't know how Git compatible Sapling is, but large parts of it are still labelled "Not yet supported publicly, OSS is buildable for unsupported experimentation." It also feels like a VCS that was designed for Facebook and then open sourced, so it is targeted at the use case of "massive company monorepo, and we have 10 guys that run the infra". That's great, because Git is bad at that use case, but it might not be what you want.