Hi Razzy,
Welcome To Jaguar Owners.
I own an X type my self so not expert on XJ or XF but can tell you that both have a 4 out 5 star rating with What car
for the XF they say
What are the most common problems with a used Jaguar XF saloon? ... However, a small number of intermittent faults and gremlins have cropped up on the XF, most prevalently in early examples. The electrics can suffer, with warning lights staying on, the touch-screen sat-nav turning itself off and the stereo sulking.
Modern Jaguars achieve some of the best reliability ratings the brand has ever had, with many customers wondering how the car's reputation was ever anything but stellar. They handle beautifully, achieve exceptional performance and fuel economy, and garner brand loyalty that few other vehicles earn from their owners.
The XJ
The speed of the Jaguar XJ, combined with its low driving position, wraparound cockpit, and sharp handling mean it's the best driver's car in its class. It creates the impression that you're driving a sports car, until you look behind and see how much space there is.
However, the nimble handling of the Jaguar is one thing, for passengers in the back, some comfort is sacrificed: even in the long wheelbase models rear headroom isn't as good as that found in the Mercedes or Audi.
Both Beautiful cars as all Jaguars are.I am sure some of the owners of these cars here can help you further.
Kind Regards,
Julie.