PrismLauncher add some more things, such as CurseForge out of the box, it's a fork of MultiMC, so it will do all the things MultiMC can do. If you want to manage your servers easily, you might want to take a look at CraftyController ?
However, I didn't know MultiMC could sync mods between servers and clients? How does this work?
Just looking at the Infinitime repo, they seem alive and well, even changing EoL chips
https://github.com/InfiniTimeOrg/InfiniTime/releases/
https://github.com/InfiniTimeOrg/pinetime-mcuboot-bootloader/releases/tag/1.0.1