Velar's D300 or P300?

[GT03ROB]

Giving some thought to getting a Velar & looking at either a D300 or P300. Clearly the diesel gives better economy, but works out around 2K more spec for spec. Either on paper give better economy than my current old RRS. Any thoughts on which is better choice? A 2l 4cylinder petrol chucking out 300bhp just sounds wrong & sounds stressed.