The best features One offers, in my opinion, are the VPN, the extra photo editing features in Google Photos and of course my 2 TB of storage… However, when using my iPhone or Mac using iOS, the VPN & Editing Add-ons will not work.
The storage itself spans across my Gmail, Photos, Calendar and other apps/programs that utilize cloud storage seamlessly and effortlessly. Another positive is, on the rare occasions I need support for Gmail or any Google family of programs/features, the preferred treatment by Google Support is definitely lovely.
Lastly, for me, the perks don’t manifest into savings per se. The discounts on hotels are on par with those I received already via booking apps and loyalty programs. Also the retail discounts are negligible at best for how often I have a need for Google retail products.
So, while I am not against it, on iPhone/iPad/Mac, Google One is nothing to write home about.