If you're confused, that means you can afford the flagship. So if I were you, I'd get the flagship and call it a day.

Buyer's remorse is no joke. I made the mistake of choosing a cheaper car twice.

I think this is not buyer's remorse in TS' context. There are always better products coming out later. Even if you waited, your model would still be outdated and "out gadgeted" when newer models arrive.

In TS' context, both choices are available now. It's a matter of choosing a cheaper one vs a more expensive but better equipped variant.

In future, if he almost knocks into a car, would he wish he'd chosen the one with ADAS?