turbo or yet 16v

hi to all I want to get a calli again but not yet quite which engine I am really fascinated by the turbo but how does this look with the durability of the turbos i.e. the motor from since the turbo the engine is still a bit strained and on what should one pay attention to when buying a turbos ? I have one in sight but the has run 178 Tkm and I don’t know if and what still needs to be done or what with the time and increasing kilometers of costs and repairs a n/a