I have never owned a GM vehicle, not any real reason, just that each time I was in the market, their products didn't compete well. Tried a few, rented many. I've had many Fords, and they have been okay but with a few duds.
I wouldn't recommend any automotive stocks. I think there is far too much capacity in the automarket, and with the switch away from ICE to battery / fuel cell / other motive power...it might take 20 years before a clear winner is decided. Next 10 years will be chaos me thinks. Add in the current 14-25 year olds in urban areas don't have much passion for car ownership, they prefer public transit or Uber to owning.