For me, playing the first game at home is better, solely because I think if we get a good result at Camp Nou (a match which we will be favorites) we will be extra motivated to avoid another Roma situation.
I think it will add more incentive and motivation to our players and manager play be much more focused and intensive at Ainfield. Last few years (including this one) we've struggled hard when we'd played the away leg first.
We have to blindside them at Camp Nou though. As great as Ainfield is on a European night, Camp Nou is the current dominant fortress of Europe.