Jag would be the most reliable choice.

 

I think the 911 is probably more reliable.

 

"....is british Aluminium actually steal in disguise"...

 

Jaguar every time the service I got from porsche in the Uk was appalling
3rd porche i brought from AFN chiswick two days into picking up brand new I got this intermittent thudding noise when i braked so contacted them and they suggested i bring it back after a long wait i explained the problem to the service guy and told him i was told to bring it in he asked me what was the book in number I said I hadn't been given one To which he replied Likely story
I walk out stupidly should of left the car and demanded my money back
They apologised the next day and someone came to pick the car up
they told me there was nothing wrong with it two days later it recurred and went back again told there was nothing wrong with it and that this was a high performance car and I was not able to drive properly
I took an engineer out with me and just as we were coming into the show room had the problem recur and was told surprise surprise this was not normal