I have three of the four... P09, Bersa and Xcal. I'm more accurate with the Xcal and it feels a smidge better in my hand than the P09 and Bersa. All have great triggers, the p09 has the CGW trigger job+some mods of my own bringing the SA down to 2lbs and 5.11lbs. DA. The Xcal has part 52 removed and is 2.3 SA, 5.12 DA. The Bersa is stock and is 3.1/6.13.
Reliability wise P09. However,I don't have enough time with the Bersa... maybe about 500 rounds so far, but no issues. The size of the magazine release on the Bersa is an issue for me though, it's hard to hit. If an extended one isn't offered in the near future it may go on the chopping block.
I also have a CZ shadow custom which I'm as accurate or a little bit more accurate with than the Xcal and it's been totally reliable. The other guys... I have most of them, but would take the CZ shadow custom, P09 or Grand Power Xcal over them. I've never owned the Wilson Beretta... yet.
But in all, it comes down to how it feels in your hand and what your going to use it for. For target/competition shooting, my preference would be the Shadow Custom and Grand Power Xcal, for self defense the P09. That's not saying the P09 wouldn't make a fine competition gun, I just think the other two do it a smidge better.
I'm sure others will have a different take on this though.
Hope this helps you a bit.