I have driven both and enjoy both. But, like most people here, I am addicted to the power of the SRT. Just knowing I can flash to speed is fun for me. Even my wife likes it. One thing I would look out for on any XF is the rear hatch area. The place that I bought mine from had three XFer's and they all had water leaks coming from the rear wing area. One was a NA and the other two SRT's. I bought one of the SRT's and the first thing I did is solve the water leak problem. I normally would have had the dealer fix it before I bought, but he wasn't willing to fix anything. Since he was only asking $9,400.00 for the car I didn't argue. Just look in the rear area under the jack for condensation/water. Since you are in England where it has been known to rain heavily from time to time, it is worth a look.