Can't go wrong with a P226, so I'd cast a vote for that. As for the M&P, I've got a 9c as my carry gun - it's one of the longest held 9mm I've owned at just over 2 years - like you, I tend to hold them a few months, get bored or disgusted, and move on. The M&P has stayed though. Yes it had a gritty trigger, at first, but after 500+ rounds, it's become a nice trigger. You could always have a trigger job done if that's your only complaint.