Either is easy, but 2 factors usually turn me to Skylink. First, how much 'tote' are you toteing? Then, with extra time (and 1.5 hours is more than enough), I often ride Skylink all the way around to see the a/c on the tarmac/gates. Better viewing than the walk for those of us who grew up watching airplanes (and there are fewer good vantage points left in US airports to see them).