Petrol vs diesel is a difficult one. If you are doing less than 12,000 miles, tgen petrol is best, cheaper fuel etc, if over, then if it’s long drives diesel can be better, but petrol warms up quicker, is quieter at rest.
if you are doing a lot of short trips, again petrol ys better, you don’t get the DPF problems which short diesel trips cause
You will see diesels disappearing from the scheme as manufacturers delete them from their lists