I have been experimenting for a while with Prepar3D (P3D), the continuation of the retired FSX/ESP platform, which is published by Lockheed Martin and directed towards professional and academic use.
Since P3D is still basically ESP (the pro version of FSX) with a different UI and some minor functional changes, it is hardly surprising that Draken works more or less out of the box. In my first side-by-side testing Draken actually flew smoother in P3D than in FSX, although this might just be because P3D is a fresh install.
Being meant (and priced) for pro users, and with promises of actual technical support (!), P3D would seem to be the natural choice for cockpit builders and other pro or semi-pro users. Well, we’ll see.
Anyway, I will continue testing P3D and report my results here.