Looks like the differences are: July - Geiranger, Gudvangen, Arendal August - Skagen, Olden, Akureyri   Neither Arendal or Skagen are terribly common cruise calls, and both are more known as low-key summer destinations for the surrounding regions. I wouldn’t let either weigh heavily in my opinion unless you have a particular sight you’re keen on. The Gudvangen call is short but only seems to cut an hour from the time in Flåm and means you’d be sailing through the UNESCO-