Making things simple usually works fine:
- / on SSD – next to Windows and EFI partition (if relevant)
- /home on HDD
- /data on HDD for sharing files with Windows – prefer using exFAT instead of NTFS, as the former has a better support on Linux than the former.
- Swap file or partition on SSD
Regarding Btrfs snapshots, by default the installer will use scheme compatible with Timeshift, which is also installed by default, and does not include user files (/home) by default.