Was in Berlin last week for my second visit to see my adopted German side BFC Dynamo - since their promotion to the Regionalliga (tier four) they've moved from the 10,000-ish capacity Sportforum back to their historical home, the Frederick-Ludwig-Jahn-Sportpark, which is all-seater with double the space. But the Sportforum was too big for the often c.1000 crowds as it was so the Sportpark, with its seats and smaller fanzone (compared to the old park) makes it a poor comparison to me... Sportforum for me any day of the week.
(the poor quality smartphone pics from two years ago of the Sportforum are mine - bigger ground photo isn'y!)