I would always say “buy on condition”, but you’ve said they’re much the same.
What are the service histories like? How many miles will you do? What are the service schedules like for these cars? Any big expenses scheduled at, say, 60k might influence you.
All else being equal I’d be more inclined to go for the newer one. It’s done around 20-25k per year, depending on when in 2012 is was first registered. To my mind this is preferable to one that’s just done around 5-6k a year, which makes me think of a lot of very short journeys where the engine and fluids haven’t got warmed through.
Clearly that’s based on internet assumptions, though, so I’d be trying to verify what kind of life each car has had to date.
Alternatively, which colour do you prefer…?