Takes 5 miles to warm up a diesel before you see any gains

BUT .... £20 a year to tax a diesel where as the petrol is £66 for 6 months

The diesel is very slightly dearer to insure over the petrol

Ive got a petrol and it's a good car, good handling, cheap to run and quite nippy, and loads of tuning bits out there if that's your thing

It's personal preference, I prefer petrol's