
Segway
Ninebot Max G3
Durable hill-climber; heavy with limited range.

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At 210lbs and a 9 percent grade you definitely need more than a standard motor.I would skip the cheap 350W models and go straight for the iScooter i10.It has a 650W motor that handles hills way better for our weight classThe build quality is solid and it folds down quickly for bringing into your office.It has dual suspension too which makes a huge difference on uneven city roads.You can usually find it under your 500 dollar budget on their official site right now.
Consider the iScooter i10 because it has a 650W motor which makes a huge difference if you have any hills on your way to the gym the 10 inch tires make the ride feel way more stable than those smaller rental scooters you might be used to.It is very reliable for daily commuting and folds up easily to store inside your workplace.You can grab it on their global site for around $450 and use the extra cash to buy a solid helmet and their waterproof front bag for your gym essentials.
I should have researched more before my first scooter (iScooter i10 Commuter) it was ok but not enough distance and power. I just got a VMAX V2 Extreme GT and it’s everything I need. I get 35km around the city which is more than enough. I could probably get 40+km on a flat straight ride. Lots of power on hills and very quality made
I think the i10 is a solid choice- 25mph, 40ish km range. the i10 is definitely good if you want power and range, but if you want something more convenient, get the i9ultra since it's lighter
I got an iScooter i10, 650w, 45km range, 40kmh max speed, double air suspension, and rear disc brake. All with Bluetooth lock through the app All for 260€
been riding escooters for couple years now and that F25 is solid choice so you already know what works from your list the D28E would be my pick - has front suspension which will help a lot in village roads. the Xiaomi models are reliable but no suspension so might be rough ride on uneven surfaces segway generally better build quality than iScooter models in my experience. also check what kind of terrain your brother will ride most - if its really rough roads might want to look at models with pneumatic tires instead of solid ones one thing to consider is service availability in his area since some brands harder to get parts for

Segway
Ninebot Max G3
Durable hill-climber; heavy with limited range.

Ausom
DT2 Pro
Budget speed demon with hydraulic brakes; slow charging.

Inmotion
Climber
Hill climbing champ, great value, but lacks suspension.

Segway
Ninebot KickScooter MAX G30P
Durable, mod-friendly value, but lacks suspension; tire changes hard.

Segway
Ninebot MAX G30LP
Durable, budget commuter, but slow on inclines and no suspension.

Ranked #1
Inmotion - Climber

Ranked #1
Inmotion - Climber

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NIU - KQi Air

Ranked #1
Segway - GT3 Pro

Ranked #1
Segway - ZT3 Pro

Ranked #1
Segway - Ninebot Max G3