I took the time to go through ALL the dates and came to the conclusion Luxembourg is the better one. The venue only holds 6 500 people (probably the smallest of the tour). There is no VIP tickets such as Golden or Silver. Only two: Early Entry and Meet and Greet.
I got the Early Entry one so I suppose if I go there early, I will be quite ahead of the normal attendance. Fingers crossed!
If you want a good seat there is not a lot to choose from other than Denmark or Belgium. Poland is alright too.