Which is better for commuting?

The Gazelle Medeo T9 HMB. Its Bosch mid-drive, 9-speed gearing and lighter frame suit daily paved rides. The GoTrax F3 works for commuting too, but its fat tires and weight make it slower to handle in traffic.

Which handles off-road better?

The GoTrax F3. Its 20 x 4 inch fat tires and front suspension are built for gravel, sand and dirt. The Gazelle's 27.5 inch city tires are meant for pavement.

The Gazelle generally holds up better over years of daily use. Bosch motors and batteries have a strong reliability record, and the rigid frame has fewer wear points than a folding hinge.

Is the GoTrax F3 worth stepping up to over the Gazelle?

Only if folding and fat tires matter to you. If you ride mostly city streets, the Gazelle's motor, fit and gearing are the better long-term choice.

Can the GoTrax F3 fit in a car?

Yes. The folding aluminum frame lets it fit in a trunk or back seat, though at 58.3 lbs it takes some effort to lift.

Which is better for taller or shorter riders?

The Gazelle. It comes in XS, S, M and L frames. The GoTrax F3 has one frame size, so fit depends on your height.

GoTrax F3 Folding E-Bike vs Gazelle Medeo T9 HMB

The GoTrax F3 is the better pick for riders who want fat tires, a folding frame and long claimed range for mixed terrain and car trunks. The Gazelle Medeo T9 HMB is the better pick for daily city riding, with a Bosch Active Line Plus motor, 9-speed gearing and a lighter frame that feels more refined. The GoTrax wins on versatility and portability; the Gazelle wins on motor quality, fit and long-term durability.

Choose the GoTrax F3 if you want a folding fat-tire e-bike for off-road paths, travel and tight storage.
Choose the Gazelle Medeo T9 HMB if you ride paved city streets daily and want a Bosch motor with proper frame sizing.

Prices

GoTrax F3 Folding E-Bike: $1,129.00 at JBird Bikes & eBikes Shop (checked today)
Gazelle Medeo T9 HMB: $1,999.95 at Shop (checked today)
Difference: the GoTrax F3 Folding E-Bike is $870.95 cheaper than the Gazelle Medeo T9 HMB today