1. They're way ahead of everyone else in terms of energy efficiency. Compare a Model S or X to the Jaguar iPace or Audi e-tron - the Tesla gets 30-50% more range out of the same size battery. That's a big gap.
2. Super chargers - other manufacturers have to rely on really spotty networks of third-party charging stations that are unreliable, and add friction for their customers (have to have the right card and the right connector, etc.). Teslas super chargers are in all the right places, are stupid easy to use, and always work.
3. Tesla actually wants to sell EVs. The other manufacturers are hamstrung with their legacy product groups. They're just dipping their toes in the water trying to figure out how to make the transition without 'Osborning' themselves, or doing the minimum to satisfy California regulations. Tesla is all-in and innovating at a much faster pace.