I have the opposite experience with the Lime scooters; they're my go-to. I've had a few duds, and of course anything on the street is subject to abuse and vandalism, but it's nice that outside of battery and motor issues, a five second inspection will give you a reliable indicator of how it will ride. All the electronic brakes I tried from any company make a very dangerous assumption that stopping time and distance don't matter as long as you come to a stop gently, so I stopped using scooters without mechanical brakes. The number one thing I appreciate about Lime is that they have gone entirely to mechanical brakes, atl least in my market. Bird scooters are okay, too, but I've relegated them to second choice after having some bad experiences with their speed regulators kicking in really hard (similar to the braking experience you describe, but without any warning, much less any action by the user.) Early on I experienced some inconsistency and frustration with their top speed, as well. Aggression from drivers is more likely to kill me than anything else, so when I set out on a one- or two-mile trip on city streets and realized I couldn't top 13mph, it was scary enough to make me stop and look for a different scooter.
Most of all, though, I wonder how much of my brand preferences are entirely the result of randomness.