I also tried Outlook and Zoho. I prefer Fastmail over those two, because it's really simple (may be a con for some) and has a very snappy UI.
Zoho Mail -- GMail
Zoho Writer -- Google Docs
Zoho Show -- Google Slides
Zoho Sheet -- Google Sheets
Zoho Workdrive -- Google Drive
Zoho Cliq -- Microsoft Teams (not sure what's google counterpart)
What I like in Zoho Mail:
1. Practical mailing use cases like sharing/commenting over a mail is possible.
2. Privacy focussed.
In Zoho Writer:
1. Has more business usecases solved than Gdocs - like pdf templates, sign integrations and mail merge integrations.
2. Tools are arranged better than a standard top toolbar.
I moved my email for all my domains to Fastmail.
I did not use any of their the other suite / apps so no loss there. I never found the Google Apps platform very usable over Actual apps like MS Office, or even LibreOffice. The web versions always seemed very limited. (even web version of MS Office)
If Google Workspaces wasn't around and I were building a new start up, not really sure what I'd want to pick. Fastmail is fine for my personal use, but with a company I'd want more features to control things. And then all the office apps. Possibly Libreoffice and a self hosted Nextcloud. Not really something I would want to be hand holding though.
I don't know how I'd replace gvoice, but email is easy.
I've been happy with the results.
To the nearest ledge high enough to guarantee a fatal fall from. Or maybe the nearest downed power line or water-filled bathtub (into which i could drop a plugged-in toaster).
Fastmail if you just need email, CalDAV, CardDAV, and light WebDAV.
I use (and/or administer) both daily and like them for different reasons.