I considered this in the past. Linux support for NTFS is much better than any of the mechanisms to read ext3/4/btrfs/etc on Windows/Mac. Your options for a Windows/Mac/Linux portable filesystem are basically exFAT or NTFS.
That said, now I use LUKS on Linux and Bitlocker on Windows, I've mostly just given up on a shared filesystem
That said, now I use LUKS on Linux and Bitlocker on Windows, I've mostly just given up on a shared filesystem