If you had a do-over, which would you get?

OP here. Thanks for all the thoughtful answers. I should have mentioned at the start that I'm not concerned about fuel mileage. My interest is more in serviceability, longevity, towing capacity, range, noise, cost (in extremis) of a total engine replacement--almost every aspect other than fuel consumption. Around here, diesel can cost 30-40% more than gas, so that pretty much cancels out the diesel mileage advantage.