Between those two, PPQ no contest. The stock trigger on the M&P is terrible. Sure the PPQ is more expensive stock but you have to factor in the Apex trigger and whatnot on the M&P.
Tried an M&P9 last weekend and alternating between that and my HK SFP9, the first time I tried the M&P it had me wondering if the trigger was dead, it's that mushy.
You could try the H&K, you might like it.