[mikeash]

The Bolt can't really make road trips because the fast charging network it can use is pretty bad. (That's in the US. Supposedly Europe is a lot better in this respect.) Even where the facilities exist, the Bolt's charging rate is about half of what Tesla can do.

The self-driving/driver-assistance tech gulf is pretty big. The Bolt is fairly basic, while the Model 3 will have at least Tesla's Autopilot 2 hardware, which they say will be sufficient for full self-driving once the software is done. Even if that doesn't work out, it'll have excellent traffic-aware cruise control and lane keeping at the least.

I'd say the brand is also fairly important. Not (just) because Tesla is "cool," but because Tesla is committed. Supposedly GM is planning for something like 50,000 Bolts per year, so it seems like yet another car where dealers will try to steer you to a nice pickup truck or something instead, and finding someone willing to service it could be tough.

Putting it all together, and it seems like GM is putting their toe in the water, while Tesla is balls-to-the-wall (forgive the mixed metaphor).