Sorry to say, it is not the plane, it is the pilot. But if you want a best of the best, you have to define the purpose of the plane.
1. Air Superiority
2. Ground Attack (GV's)
3. Ground Attack (Hard Targets)
4. Bombing missions
5. Long Range Bomber Escort
6. Base Defence
7. NOOB plane
etc
etc
etc
Once you define the purpose, you will get a lot of differnet answers. I love the c.205 for fighters, but it is not the most capable plane.