No cut & dry answer...
All 3 are very high quality firearms by reliable manufacturers. You really need to handle each one & see what fits your hand better and which trigger you like. Sights are similar but you may prefer one over the other.
Having owned and fired only the Sig & Beretta I can only comment on those 2 models. I'd say it's a dead tie between the two. I love my Sig & Beretta equally although my accuracy is slightly more accurate with my 92G... maybe because I've owned it longer. Both have been flawless in regards to reliability & malfunctions using quality ammo. Both are aesthetically pleasing and are easy to break down in seconds... so again, a tie.
Price is similar as well depending on where their purchased. I know I didn't give a tie breaker answer... but thats like picking your favorite child.