How to format WD My Passport Ultra for use with MacOS and ChromeOS

I have a WD My Passport Ultra. Right now it is formatted as NTFS. I’d like to change it to a format that can be used with both Mac (High Sierra) and ChromeOS.

What format should I use?

NTFS works on PCs and ChromeOS.
HFS+ works on Macs and ChromeOS
ExFAT works on all three.

Exfat it is. Thank you!