That Turbo cost nearly 2X what the Demon cost and I don't know what the mods cost but I can believe they weren't cheap...
But the Turbo comes with AWD, dual clutch transmission, and launch control that I have seen operate -- in just a N/A newer Porsche 911 -- which is awesome.
And if that MY Porsche Turbo is anything like my 2003 Porsche 996 Turbo it is a fine car with superior fit and finish. (I felt like a Swiss banker when I drove mine.)
The Turbo is a superb driving machine comfortable on a daily work commute or hammering hundreds of miles across the western US covering -- more than once in my case -- 2K miles in 2 (long) days of driving. It doesn't miss a beat leaving the freeway for a mountain road, or leaving 100F+ ambient temperatures one day and the next day driving in sub freezing temperatures and through snow a 1000 miles east.
The Demon is a beast no doubt about it but if money was no object I'd take a stock Porsche Turbo over a Demon. My usage is limited to the street and that is where I think the Turbo shines over the Demon.