Some EV specific advantages of Tesla over competition:
- Range: Teslas continue to lead in range, as result of best aerodynamics, best drive train efficiency and vertically integrated design (see Munro - highly integrated component).
- Charging infrastructure: largest available and most reliable (see MKBHD for e.g.).
- Regular software updates improving everything from range, to charge planning (recently added much better estimate based on wind direction, inclination, tyre pressure, weather, etc) to safety, etc.
- and most important of all: Availability and production volume. Best EV in the world isn't worth anything if you can't buy it.
If you look forward and see what Tesla is doing with its manufacturing innovations, it should become clear that things like in-house battery production, single front and rear casting among numerous other things has already secured their top position for sometime to come.