I responed to this part of your question in the other thread, but I'll repeat it here since it did seem to get overlooked.
I went to to gun shop to look at the M&P Pro with the intention of buying it if I liked it. I liked it except for the trigger, which is supposed to be better on the Pro model than the non Pro model. Then I spotted an FNX and dry fired it. I liked the SA trigger much better on the FNX so that's what I got. No regrets.
So in my case, the trigger made the difference. Again, these are my impressions and I'm sure others will have different opinions. Here's another picture just because I like this pistol so much: