I have a 12 year old Impreza. Haven't spent a penny other than standard maintenance and replacements.

I'd test drive both and buy whichever you prefer. Subaru has superior sight lines but the interior of the Mazda is leaps and bounds nicer.

I've had Subaru Foresters for over ten years with one ten years old and one two. The only reason I have a two year old Forester is that my previous one, also ten years old, got wrecked in a hurricane.