Which is more manoeuvrable?
The B/C Mustang... If you're talking typical "dog-fighting" turn-fights.. The Pony had the edge in turn-radius and wouldn't bleed airspeed in the vertical as fast as the FW....
I would say between these two, it would come down to the pilot.
Yepper..
Chuck Yeager said it best.. "The pilot with the most experience is gonna whip your azz every time, no matter what he's flying.."... (This was after Yeager whipped an RAF pilot flying an F-86 against him in a MiG-15, then they switched, and Yeager did it to him again..)
However, given we're that we're talking about the C (or B, they're the same thing. Only measurable difference was where they were built, ie: Dallas, TX or Inglewood, CA), the B/C Pony had a tighter turn radius than the D/K had... There was also an issue with the early B/C Mustangs' guns in high-g turns, but this was solved with powered feed-pawls..
First two things to remember is that "Speed is Life, and Altitude is Life Insurance"... "Zoom and Boom" attacks are always preferable.. But when it comes down to a turn-fight, the Fw190 is out-classed, the way I read it... Like what was mentioned with dropping 10-deg of flaps in a fight, the Mustang could hang right on the edge of a stall ( and the pilot kicked in opposite rudder to keep the nose up), with little chance of departure, while the FW needed to widen the turn a bit to keep it from departing in a rather vicious snap-roll and little to no warning... Going into the vertical, the Mustang had it over the FW as well..
Dad flew both the B and D, and he always told me of the two, he preferred the B... Once he got a Malcolm Hood, that is... Rearward vis in Malcolm-equipped Mustang ws almost as good as the D's bubble canopy, and the addition of two more guns and their ammo brought the weight up by almost 350 lbs and decreased the performance at low-speed/low-altitudes... But the Ds were what they got instead of new B/Cs, and since the Bs were clapped-out by that time anyway, they liked them too...
Bottom line was that, all things being equal, if a 190 got on your six, you had about half a heartbeat to make peace with your maker if you didn't shake him... Those cannons and guns on the Butcherbird would eat you alive... Luckily, the Germans had way more in the way of Fw190s than they had in experienced pilots...
When an American pilot with 300-400 hours (The USAAF considered it tantemount to murder to send a pilot into combat with less than 250 hours) went up against a typical, late-war German Jagdflieger, who had about 10-15 hours, the result was pretty one-sided...