I had an XJ6 a few years back, having started out after an XJS. They’re based on the same chassis.
From my research at the time, the XJS was built down to a price and is filled with gremlins. The Jag. specialist who advised me was adamant that you got a lot more XJ6 for your money. I think the electrics proved particularly problematic on the XJS.
The XJ6 was a great car, fast and comfortable, and it really turned heads. I was able to get a well serviced “old man’s car” for about £1,600 and it was pretty sound. Got rid after a couple of years when the sun roof started leaking (sorry to the chap that took it).
If I was doing it again, I’d go for the Daimler 🙂
APF