2014 A6 allroad 3.0 TDI or Range Rover supercharded

[3.7 slp]

My sis is looking to get a new car and get rid of her A6 . it has the 3.0TID unit in it . Was wondering what they are like to live with have driven it and its a nice drive...I have an 2003 A8 D3 4.2 so was thinking how it would compare to that .

I was also looking at an Range Rover Supercharged around 2005
as a replacement for the A8 ....
...I need something big and easy for my mum to get in and out of ...
..so any options on

1 the all road A6 3.0 2014
or
2 The Range Supercharged 4.2 v8

Also has anyone had the 3.0 tdi remapped and the outcome.

would be very welcome.

Many thanks all