Distrobox was always stable for me. Autocomplete only in bash but that doesnt matter much. Waaay more images by default but not as curated, also many are maintained by Fedora people and not the Distrobox people, so its not like they actually support more but just ship.
This is a big difference, Toolbox also supports these images.
But featurewise distrobox is brilliant, love the app icon export, the binaries are maybe a bit bloated.