It should be obvious that Tesla is going to win this race. Tesla already does fully autonomous driving, they released that video in November. And they build real, production cars. "Real artists ship", as Steve Jobs said.
If you a manufacturing ace, would you join the company with a long list of failed projects and no actual production cars, or would you join the company that is building 500,000 of the most advanced autos right now?
If I was a hardware expert, would I join Google who shies at giving a fraction of it's cash to hard tech, or Tesla who buys german automation companies?
Or plain old software. Tesla has magnitudes more data and can update neural networks to hundreds of thousands of cars at a whim. Soon millions.