From an engineering perspective, two electric motors using a digital limited slip differential like the Corvettes, Cadillacs, Camaros, and others do, will do the best job for public roads, performance, and snow/dirt.
With the current "fake LSD" the electric motor uses the brakes to emulate an LSD, wasting HP available, yet having full load on the motor.
With 4 motors, the inside tire can't put down it's torque, so it cannot help accelerate. It doesn't 'waste' power, it just has to derate in corners.
With a digital LSD, the entire motor output is divided among both tires. Say the inside tire can only handle 20% of the power, that's all it gets to use, the other 80% of available HP goes outboard.
The nicest thing about 4 motor systems is the more compact layout possibilities and perhaps quicker RPM gain, but that's not really an issue.
Single motors will eventually dominate. AWD is not faster around corners, it's just a way to go get launch traction. Lateral grip determines cornering speed, and thrust/braking reduces lateral grip. Ever punch a FWD/AWD too early on a exit? It stops the car from rotating and you go wide.