Honestly Google Drive works great as free storage (Though for large storage there's no guarantee they won't accidentally delete it, it's happened before).
And Google Suite is good enough if you can't be bothered to get Microsoft Office. Though they're forcing AI into it and have some weird quirks like being unable to copypaste external text with rightclick.
Microsoft has free storage options too. As does Dropbox, et al.
G Suite is actually pretty good all things considered but MS won the Office / Outlook / Excel wars ages ago. All big enterprises are running windows. That fight is over so long as MS doesn't bungle Windows11 too badly.
Gmail and Google drive are far easier to use than Outlook and OneDrive. Not saying they’re good things for the world but those products haven’t been fried yet.
I'd say convenience and shareability. I come across far more dead Dropbox links than dead Google Drive links.
And Onedrive is further down in enshittification than Drive. Like windows relentlessly trying to reenable and reinstall without permission.
Overall I like it cause it's just there and works. But I wholeheartedly would not recommend it for business applications (without backups at least). There have been instances of companies data just getting deleted or randomly banned from their google account.