There were quite a few stages I really loved.
2006 - such an interesting concept, that ancient greek amphitheatre reference
2008 - loved the idea of Sava - Danube confluence, but it should have been bigger a bit
2009 - size and overall idea with all those leds
2011 - looked like some MTV award ceremony stage, it was really good
2014 - the best stage overall, great concept, big enough, loved the water
2019 - it looks like 2014, those triangles on the ceiling looked so good