How comparable are their suspension and pdk?
Is the pdk identical? Same torque rating?

Considering both cars. Would a C4S with a ecu tune be as much fun as a turbo?

I assume a 60 hp increase. So maybe 480 hp with ecu tune only. That could be more than enough.

I've driven both..well a 2014 turbo. Turbo is insanely fast and probably as fast as I'd want for a DD.

 

The Turbo will probably hold it's value better in the long term. So if you look at cost of ownership as depreciation, particularly if you buy a slightly used 991.1 Turbo.

A used 991.1 turbo will be comparable in price to a new 991.2 C4S with nice options.