Simple choice! Just compare the one engine out performance and base your decision on that!
Donīt forget to compare all engine out performance.
The Pilatus glides better than it climbs.
1200 ft above. dep aerodrome it is always possible to glide back into the airfield.
There is a procedure for that and Pilatus is training pilots during initial rating.
I have flown both, King Airs and the Pilatus.
The cabin of the 200 and the PC12 are equal, but the Pilatus cabinfloor is all flat.
Cruise performance is nearly the same.
Pilatus needs shorter runways.
Range and payload of the Pilatus is better.
Cabin heat of the King Air is much better. If you buy a PC12, optional cockpit foot heating is a must.
Pilatus after sales service is bad. After aircraft delivery they leave you alone with it.
Beechcraft and Cessna are much better in customer care.
To compare the collins proline with the honeywell apex:
They both do the same job, but the collins is for professionals and the honeywell is a colerful gadget for the private owners.
I would like to have the collins in the PC12.