Choosing where to keep photographs and documents
The important differences are not about capacity.
What matters most is what happens when you stop paying. Some services make files read-only and keep them; others delete after a notice period. That policy decides whether a lapsed subscription is an inconvenience or a loss.
Version history is the second difference. A service that retains previous versions for a meaningful period protects against accidental deletion and against ransomware, which synchronises its damage like any other change.
Being able to export everything in a usable form matters when you want to move. Services that make bulk export difficult are harder to leave than they appear at sign-up.
For photographs specifically, check whether originals are stored or only compressed copies. Several services reduce quality on the free tier, and the originals are not recoverable afterwards.
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Describe what you are trying to work out and a member of the team will answer, or direct you to the office that makes the decision.