Other than Tesla, I feel like Volkswagen might be a good fit for Apple to work with to make an Apple car.
Elon supposedly asked Apple at some point to at least invest and perhaps join forces, but I believe he didn't even get a response from the Cook ie Monster. Seems like an odd business decision by Apple but hey Tesla still has some major QC issues so maybe that's why Apple wasn't interested or maybe they just want to compete against Tesla. I mean Apple definitely has the bank to do so.
I guess the good thing is if they don't end up pairing up, which seems highly unlikely at this point, they should end up driving each other to make better vehicles and hopefully better prices for consumers to buy into electric vehicles as their daily drivers. But an Apple tesla colab would have made a lot people drool. Without actual data I'm just going to hazard a guess that Tesla has a high percentage of owner that love

products and vice versa.