A quick search should turn up a lot of threads on both guns. There are a lot of Beretta guys on this forum. Some quick notes about both. I have owned both, and have been carrying an M9 over here for almost a year.
Very big with huge grip area
Long trigger reach in DA mode
Backwards safety/decocking lever
Smaller overall, including grip, than 92
Shorter trigger reach than 92, with generally smoother trigger action
Decocking lever with no backwards safety lever
Easier to change sights than 92
More expensive than 92
Accessory availability is excellent with both. Given the choice, I would get the P226 because of the better ergonomics. However, both guns work very well and if you like the 92 better, go for it.