I guess you either 'get it' or you don't. If you think its great then thats brilliant as you'll be happier with your car but personally I think they've been spoiling otherwise decent cars for years. They are just so gruff and noisy unless there is a whole truckload of sound deadening. All I can say is try both and decide for yourself.
Or try just the diesel, buy it, and then say how refined it is
If the refinement aspect doesn't bother you then they are great engines - the performance is reasonable, as is the fuel economy. Plus you'll always be spoilt for choice on the used market!
I honestly wish I liked them more as I don't really need the performance my 530d offers frankly and a 520d would have been much cheaper or newer for the same money.