Aurora displays 16 steps, while Synergy is wonderfully spacious 32 steps wide.
But, it seems, that you won't be able to transpose Synergy while playing live, whereas Aurora does that.
What else?
What about TNR-i?
Edit
Well shit! So I went to buy the Aurora because I was afraid the sale would be over tomorrow, and the transpose that I was so badly needing is done as awkwardly as I imagine it is done in Synergy, so there went my €25. I could have bought the other wise handier looking synergy just as well while saving money.
There is a keyboard, but you don't transpose with that. Oh no! Instead, you first touch the keyboard, after which the grid goes into a transpose mode where you must touch from as many half steps higher or lower you think you want to go, but after you have figured out how many semitones you want to jump, the time alrady went. Not to mention what happened to the melody you were trying to improvise while juggling with the transpose function.
Y not just push the key you want to go?!?