Greenland is much better logistically in some ways (I work on experiments both in Greenland and in Antarctica), but the ice in Greenland is unlikely to be as good for IceCube as in Antarctica, due to a presumed larger number of dust layers from dry periods in Europe.

The US has a research station at Summit Station Greenland but compared to South Pole, it's spartan (like, the first time I went there, I slept in a tent because of lack of hard-sided berthing, but then a Polar bear came a few years later and now hard-sided berthing is required). There are longer-term plans to improve the station in Greenland but we'll see.