IWork for cloud vs MS Office365

Hi,

i’m currently subscribed and storing documents to iCloud (drive) and using its iWork-apps (pages, keynote, numbers). The latter is about iWork for Cloud.

lots of my colleagues work with windows computers & microsoft office apps (word, powerpoint, excel) and onedrive (for storage).

is it possible to collaborate with them when only having and working with icloud drive & iWork apps?

or is it better to also subscribe additionally to ms office? (What i prefer not to do, if not needed)

e.g. when they work with word documents, than i don’t have this app, but use only pages instead

Many thanks.

kris