Which fan lasts longer on a charge?

The Jisulife. Its 4000 mAh battery is double the Gaiatop's 2000 mAh, so expect roughly twice the runtime at similar speeds.

Which is better for a stroller?

Both clip on, but the Gaiatop is lighter and smaller, so it adds less bulk to a stroller bar. The Jisulife's longer runtime suits long outings.

Is the Jisulife worth stepping up to?

Yes for most people. You get double the battery, a fourth speed, and USB-C charging. Step down to the Gaiatop only if weight is the priority.

Jisulife publishes a 40 dB noise rating and markets it as ultra-quiet. Gaiatop does not publish a noise figure, so the Jisulife is the safer bet for quiet settings.

Do both have a remote?

Yes. Both models ship with a remote control, which is useful when the fan is clipped out of reach.

Which tilts more freely?

The Gaiatop specifies 360° horizontal and 210° vertical rotation. The Jisulife lists 360° rotation without a vertical figure.

Gaiatop Clip-On Fan with Remote vs Jisulife Clip-On Portable Fan

The Jisulife is the stronger clip fan for most shoppers. It has double the battery capacity, a fourth speed, and USB-C charging, while the Gaiatop is lighter and smaller. Owners of both brands report solid clips and quiet motors, but the Jisulife's larger battery and Type-C port make it the better long-term pick. Choose the Gaiatop only if weight and a compact body matter more than runtime.

Choose the Gaiatop if you want the lightest, most compact clip fan and can live with shorter battery life.
Choose the Jisulife if you want longer runtime, an extra speed, and modern USB-C charging.

Prices

Gaiatop Clip-On Fan with Remote: $22.99 at Amazon (last seen Nov 13)
Jisulife Clip-On Portable Fan: $22.99 at Amazon (last seen Nov 13)
Difference: both cost the same at the latest prices (Nov 13)