Hello everyone.

I'd like to know, which controller model is the most popular?
Meaning, which one is the one installed in most of the different models electric scooters, bikes and mopeds?
I am inquiring on this because I have a big problem with three electric scooters of mine.
All of them have defective controllers (the controllers of these scooters is installed close to the front wheel and is not water resistant, so water gets in ...).
I bought some controllers and tried to fix one of them, but now it runs too slowly and the ignition key does not work (it does not cut-off the power).
Here's the pic of the bike:
So, in order to avoid such problems in the future (given the fact that these scooters are made in plants that have no standards, and you can not go by a model, year or part number in order to find the right part you need), I'd like to buy a bike or a scooter that will have adequate parts support.
Please, help me with an advice accordingly.

Regards.