The Spit16 is THEE crutch plane of AH. There is nothing it cant do and do very well, save for maybe a 500 TAS dive.
My issue with the 16 is the lack of perk cost. For everything it does better and only the 1 thing it does worse than the Spit 14, I'm still perplexed that it doesn't have a small perk cost (2-4?)
People will mention that "there are planes that are faster, roll better, turn better, climb better, etc", but the thing most forget about that even though the P51 is faster all the 16 has to do is match speeds with the P51 (say 300 TAS) in any maneuver and it is over for the P51. All the Spit 16 has to do vs a Hurricane or zeke is not get in to a tight 130 TAS turn, and if it does simply be climbing and it will leave the others behind. Or, if and when they catch up in that tight turn all the 16 has to do is roll °180 and out roll, accelerate, and climb away. Easy peasy. If the 16 gets in to a scissors vs its only equal in the roll (the Fw190), it has the luxury of being more forgiving, better handling at slower speeds, turning, acceleration, etc, so it can rely on far more things than just the roll rate. Point being is that if and when the Spit 16 goes up against a plane that can do something "better" than it, it is hardly worth mentioning because it is not eclipsed by much and all of the other superb attributes make up for any deficiency or "disadvantage" it may have vs a particular plane. It truly is the best dog fighter in AH.
Oh, and the 16's ability to carry 1000 lbs of ord (1186 lbs dmg) is often over looked. It was after all meant to be used as a ground attack plane. Instead, AH has it as its best fighter.