There are too many variables..... Ive owned N/A, factory turbo and now an NA-T and i have to say there isnt much difference.

You can look at it two ways, a turbo car has more parts like a turbo etc... which will wear out but lets compare an N/A I6 like the supra to an N/A V8 like a cobra mustang, is the cobra less reliable because it has 2 more cylinders, an extra head with more valves and more cams etc...??? A rotary (rx7) has very few moving parts but they arent known for superior reliability.

It all depends on who owns it,how its driven, how well its maintained and possibly location (northern cars have rust issues)