For what size of a tank??? And which euro-reef skimmer are you trying to compare with the berlin???
Anyway, the euro-reef works well for in-sump. They cannot do hang-on at all. I am not too familiar with the berlin. The remora pro I believe it's a hang-on as well. If it's aqua-c in-sump type, it's the Urchin Pro skimmer. I do run a regular remora over a nano tank and it does pull out a lot of junk every week. It's fairly thick dark junk, so I like it too.