Easyjet's presence at Gatwick might be larger than Ryanair's at Stansted but the important thing to consider is the proportion of flights this makes up overall, around 35-40% in EZY's case and around 70% in Stansted's case. Easy are also directly competed with on far more routes out of Gatwick by BA, Monarch, Flybe, Thomson, Aer Lingus, Thomas Cook and numerous foreign airlines. Ryanair at Stansted have some routes that overlap with Easyjet and some where Thomson/Thomas Cook compete fairly indirectly, so the scale of the dominance is very different.