There have been many improvements in the diesel engine in the past few years, and it looks like the diesel may be in for a come back. There is a lot of renewed interest in diesel passenger cars and light trucks. Even Mercedes is putting out a diesel E class sedan. When Mercedes talks, auto manufacturers listen.
The final choice of whether to buy diesel or gasoline engines is up to the individual buyer, and what he is looking for. What are you going to use the vehicle for? How many miles you travel in a year? Do you do any heavy hauling with your vehicle? Do You want your car to pass the 200,000 mile mark?
Gas engines run smoother, but the diesel engine beats the gas hands down when it comes to staying power. Diesels last just about forever when they are taken care of properly, and they are work horses when it comes to hauling and towing.
The diesel generally costs a little more, but not all that much. With today's car prices what they are, two thousand dollars for a vehicle that will last twice as long is not asking too much.
The best advice you can get is to try both types of vehicles, drive them, check them out, look online for all the information you can get about both types of engines. Knowledge is power, and you can make the best choice for yourself if you are armed with information about the car you decide to buy.