Which one should you actually buy?

We bought all four, used them for six weeks, and wrote down what broke. Nobody paid to be in this.
Battery is measured, not quoted. Every figure here we took ourselves.
Metro OneNorthline ProKestrel AirAtlas Mini
Price249319199149
Battery, measured41 hours28 hours33 hours19 hours
Weight214 g268 g190 g176 g
Charges byUSB-CUSB-CProprietaryUSB-C
Spare parts soldYesYes----
RepairableYesPartly----
Warranty3 years2 years2 years1 year
Would we buy itYesIf on offer--For a child

Why the Metro One

The reasoning, so you can disagree with it.

It lasted longest

Forty-one hours against a claimed thirty-six. The only one that beat its own box.

You can open it

Four screws and a published parts list. Two of the others are glued shut.

It is not the cheapest

The Atlas is a hundred less and fine for a child. We say so above.