Grasshopers are nothing special while AEK is an experienced team well known in europe,last year they draw against Real in Madrid.
Grasshopers has the advantage of the 1-0 (first leg),which will force AEK to play offensively.Both teams will miss one important defender each.Okkas (AEK striker) whose absence was critical during the first leg(he played limited time)is fully ready and motivated for this match,this year he has scored at every match.
Its no bet for me,if I had to bet,that would be 1/1 AEK.