Aircon in my 2001 Defender was much better than my 2005.
I like my Td5 and have had no big dramas. Oil in harness - less than $400 repair by dealer. Cheaper if you are half decent with a spanner and screwdriver.
Puma certainly goes better on the highway......but then again so does a transit van!:p
I reckon you role the dice and take your chances. Either of them could be fine.

