I've driven cars that have lots of different diffs, spoon, cusco etc. Depending on who's telling the stories most JDM brands come form the same factory, but can't confirm that.
I'm just about to install an ATS plate diff in my EK9 race car, so I'll be sure to give you a bit of feedback on it. So far the best diff I've driven on has been the J's Racing 1.5 way - absolutely phenomenal grip on both acceleration and deceleration.