For me it’s parking sensors and walk-away lock (Sport Touring Hybrid). I’m a simple man that came from a 2013 Dodge Dart base trim lol. I use the parking sensors all of the time pulling into our cluttered garage as well as at work where I park in a parking garage and no longer have to guess how far to pull up. The walk-away lock is so convenient. My keys/fob never leave my pocket. It’s the little things!
For me, I think it was a Jetta GLI with the Prius coming in 3rd. I realize the GLI and the Civic Sport Touring (my car) are very different in so many ways, but they are similarly priced sedans. The GLI has more torque and hp, decent fuel economy and looks sharp. I actually never test drove the GLI and I honestly didn’t know it existed until after I purchased my car. No buyers remorse for me though as the Civic has better resale value, reliability, fuel economy, etc. which is all more than enough for me to feel great about my choice. LOVE my car, but I do play “what if?” with the GLI and a little less, with the Prius.