Yea, I just started to put my VMs on a 4th partition, 200gb on a 1TB so that I can share VMs btwn 3 OS's natively, macOS, Windows or Linux. I picked NTFS for that scenario as I am more confident in ALL 3 being able to read and write to it properly - however I know there will always be a risk of data corruption when having an OS read a format that is not native to it. I still want the pro of being able to write large files though, so I've made the trade off.

One thing that I have also done is ensured that my actual Windows partition will never be mounted in write mode from any other OS by changing some settings. The VM partition is read-write obviously.

Windows for now is my primary OS but that may switch to Linux. In any event if the 200gb isn't enough space then I will likely just shuffle things around under Windows so that the VMs I am currently working with will be available to all 3. All in all I like this solution best, I dedicate the most space to my primary and I dedicate just enough to the rest while have the shared space as well. I feel confident this will not result in having to reload an entire OS, which is something I want to actively avoid and is a risk with dual or triple boot systems.