LAst week I owned a spit 14 in a one on one, total fluke lol.
Thing I noticed, while the p51 at low speed may want to roll over and nose in, the spit 14 will do it alot sooner.
Also it seems if you push the 14 to much you can lose it and it may be hard to recover.
I pick the 51, but then again, I love flying it.