The Clarion is IMHO much nicer than the Radisson hotels at ARN, although the walk to and from the Clarion is probably 32 seconds longer than the walk to the Radisson Sky City ...
If doing this with baggage, it's much better to choose a hotel at the airport. You can check in your bags when you leave the hotel in the morning. Why drag bags round-trip to the city and back just to sleep a few hours?