I think that AAI2 is definitely up there on the rankings. I'd put it next to Trials and Tribulations. The music is also great, as expected. Its got my second favorite pursuit theme, and the big bad music is really good. Most of the new characters are good ( I despised some of them at the beginning, but they grow on you near the end), you see some old faces again, and you get to play as Gregory Edgeworth at one point in the game. The way all the cases connect to each other in the end is also great. The new mechanic, Logic Chess, is also really fun, though its hard to fuck it up.