Looking to buy one or the other a Mondeo Mk4 or a Mazda 6

Any ideas which to go for? which is better?

looking at the 2.0d engine on both
want either Titanium or Titanium X trim on the mondeo.

What mileage are the main services at (the costly ones) as i'm looking at getting one between 75-85k miles on a 57-58 plate

What faults should I be looking for when buying etc.