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Cloud storage pricing is close enough across these four that the deciding factor is really which ecosystem your devices and files already live in — picking against that grain creates ongoing friction no amount of extra gigabytes fixes.
Google One: the natural choice for Android and Gmail users
Google One pools storage across Gmail, Google Photos, and Google Drive under one plan, and if you're on Android or already live in Gmail daily, it's the path of least resistance — no separate app to think about, storage just quietly covers everything you're already using.
iCloud+: essential if you're on Apple hardware
iCloud+ isn't really optional if you own an iPhone — photo backup, device backup, and Messages sync all depend on it working smoothly, and letting it run out of space causes real friction across every Apple device you own. For Apple households specifically, this is less a choice between competing products and more a maintenance cost of the ecosystem.
Dropbox: the best for cross-platform file sharing and collaboration
Dropbox Plus/Family/Professional isn't tied to any single device ecosystem, which makes it the strongest pick if you regularly share large files with people on different platforms — its sharing links and version history are more mature than the ecosystem-first tools above, built specifically around collaboration rather than personal device backup.
OneDrive: the right call if you're in Microsoft 365
OneDrive Premium comes bundled into Microsoft 365 Personal and Family plans, making it close to free extra value if you're already paying for Word, Excel, and Outlook — the storage essentially rides along with a subscription many people already have for other reasons.
Don't double-pay across ecosystems
A common and avoidable mistake is paying for a large plan on one service while a device is quietly also filling up storage on another (an iPhone backing up to iCloud while you also pay for a large Google One plan you barely use) — check which service is actually consuming space on your specific devices before assuming you need to upgrade the plan you happen to be looking at.
Family plans change the per-person math significantly
All four offer family or multi-user tiers that split storage across several people at a lower per-person cost than individual plans stacked separately — worth checking family pricing directly if more than one person in your household needs storage rather than defaulting to individual plans for everyone.
Automatic photo backup quality varies
If photo backup is a primary use case, compare each service's automatic organization and search features directly — Google Photos' AI-powered search (searching by content, like "beach" or a person's face) is generally considered the most capable of the four, which matters if you have years of accumulated photos you actually want to find later rather than just store.
All four also offer some form of ransomware protection or file version history, letting you restore a previous version of a file if it's corrupted or accidentally overwritten — worth confirming how many days of version history your specific plan tier includes before assuming unlimited rollback.
The bottom line
Android and Gmail-first: Google One. iPhone or Mac owner: iCloud+ isn't really optional. Cross-platform sharing and collaboration: Dropbox. Already paying for Microsoft 365: OneDrive comes along for the ride. All four are compared in Productivity & Education.