Stansted has a fast rail service, as does the increasingly busy Saarfen'.
Would only use Stansted as a last resort. After putting up with years of fighting my way through crowds just milling around the place, tripping over ski bags and trying to avoid the mid morning lager swilling types, I ventured down to London City. Fantastic little airport, Swiss Air were cheaper than Easy Jet out of Stansted, far nicer atmosphere, more civilized clientelle and even the drugs dog seemed happy to see me.