Better build quality, driving dynamics and competitive pricing vs Tesla's charging network. At least in the US East Coast, and use cases where people are using Tesla M3, the i4 will have a good enough charging network. Both Apple and Google Maps now include EV charging in their navigation.
https://insideevs.com/news/557180/bm...l3-comparison/
Looks like with the i4 and iX BMW finally gets EV right. IMHO.