Superior is better in that you can use EZ drummer through it and add EQ and compression, bleed control and what not but i have also notices that EZ sounds more realistic.
YouTube - Circus Maximus - The First Chapter Part 1
I did the begining of this song (the intro cymbal stuff) and it sounded great in EZ but in Superior is sounded very midi and it just sounded like he was hitting it seperately over and over again. where as EZ flowed nicely.