WacOS by default has 5 options for a file system upon install. The current 5 options are:
Support for HFS, APFS, and OpenZFS is currently experimental. APFS might be the hardest, due to it being so new, and having to be reverse engineered first. HFS might be difficult as well due to how old the format is.
BTRFS is currently under consideration for being a 6th option for a default file system.
For Apple fans: HFS+, APFS
For less-technical Apple fans: EXT4
For Apple fans with old Apple virtual machines: HFS
For everyone: EXT4
For massive data: OpenZFS