The 15400 has the 'too small' assemlby line constructed 3120; the 15202, the historic 'JLC 920' assembled by one watchmaker. They are also completely different aesthetics. The stack height of the 2 hands on the 15202 makes it exceptionally elegant. The 15400 more chunky. Good luck.
Pretty average to poor. Especially if you are cogniscent enough of your positional performance to rest overnight in suitable position to gain or lose against real time. You should achieve close to 0 PPs are supposed to run -3 2 s/d according to their own website R