Ryanair and easyJet both price competitively, but rarely compete directly against each other from the same pair of airports. Sometimes Ryanair will be cheaper, sometimes easyJet, but the context may well involve different airports and different times of the day. Both airlines use airports which vary from some of Europe's largest airports to places which aren't much more than an airstrip in the middle of nowhere. It's difficult to generalise here other than it is certainly true that some of Ryanair's airports are a bit obscure. The same could be said of easyJet. So for example Ryanair use Beauvais airport, north of Paris, which is some distance from central Paris, equally easyJet uses Southend, which is some distance from London. But if your hotel was close to Porte Maillot or Stratford, respectively, then both airports are potentially sensible choices.