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

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I have the KQi2 Pro which was, loosely speaking, the predecessor to this one, and it handles moderate hills just fine. Mine maxes out at 18mph flat ground because of a limiter (I'm fine with that) but it clearly has extra oomph for when I go up an incline. I am assuming you are talking 2-4% hills and not anything much much steeper.
I bought a KQI2 Pro this holiday season, not because it had great specs but because it was $360 on sale. I did not have intense needs for it, nor did I have high expectations. It was immediately a huge jump from the Ninebot ES line (two successive scooters) that I'd been struggling with for about 6 years. It is not amazing, but I didn't need it to be fast or to tackle crazy hills/distance. It is just fine for grocery runs or trips to work. It's very nice for trips from Manhattan to the outer boroughs, as it gets about 18-20 miles range from 100% to 0% power and there aren't many places I need to go where I'd have to take it any farther. It's heavy, like most scooters in this category. The KQi Air is probably what I'd really get if cost were no issue. It has the range I need, the ride quality I need, and it's 40% lighter. I have talked to people with other scooters, and Ninebot/NIU are the only game in town. A friend of mine got an Apollo that can't even get out of the apartment without a $200 repair job out-of-the-box.
i dont think they sell it anymore but i bought a niu kqi2 pro for 300 dollars last year and ive put over 400 miles on it about a year
It might not be the upgrade you're looking for, but the KQI3 max is great, way better than my KQI2 pro.
Never had an issue with the Ninebot Max G30 in rain or snow. Same with the NIU KQi2 Pro, been through multiple storms, so far still runs great https://www.youtube.com/watch?v=4-GrSpbhWH8 and based on the disassembly it has well sealed internals https://www.youtube.com/watch?v=2GT5LiTJ8D8 so I am not worried.
I've got a Niu KQi2 pro, first scooter. The thing is small enough and light enough to carry on the bus. If i had had the cash, i would now go for the Air! Anything bigger and heavier than the KQI2 would be a pain to carry around. Edit: oh ya, speed limit @25 kph here, so more power only means less loss of speed going uphill.
Niu makes great scooters. Kqi 100 or 200 for mid rage budget with decent reliability. Kqi2Pro for better reliability and more range

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

Ranked #1
NIU - KQi Air

Ranked #1
Segway - GT3 Pro

Ranked #1
Segway - ZT3 Pro

Ranked #1
Segway - Ninebot Max G3