Sileo version 1.5.0 has been released, it includes iOS 13 support, Dark Mode, and also includes 30% faster performance for support devices.
Note that this has been available as a beta since September 12th.
Sileo is the package manager that is used with Electra and Chimera jailbreaks. And is currently unavailable for any jailbreak that uses Cydia Substrate or the unc0ver Substrate Substitute.
Cydia cannot be used with CoolStar’s substitute as it is not supported. While Zebra can be used on all jailbreaks by just adding their repository.
Currently the top three package managers used are Cydia, Sileo, and Zebra. Cydia is by far the oldest, most stable package manager, while Sileo is fast and sometimes unstable package manager. Zebra is a bit of a combination with a few more features.
Just to clarify:
Sileo – Chimera and Electra jailbreaks
Cydia – Any other jailbreak but Chimera and Electra jailbreaks
Zebra – Any jailbreak by just adding the repository
Sileo* – https://electrarepo64.coolstar.org/
Zebra – https://getzbra.com/repo/
Cydia* – https://apt.binger.com/
*Please remember that Sileo and Cydia only work with specific jailbreaks.