LGW and LHR are both easy to get to and the fact that this argument continues is ridiculous as it all depends from what direction your coming from or if your traveling by car or public transport, for an example where I live in Southampton in Hampshire LHR is 55 miles and takes approximately one hour and LGW 70 miles away and takes about one hour and 20 mins, STN being a lot further and my third choice is 123 miles away and doable in less than two hours.
Seems everyone moans about traveling distance to LGW and LHR but personally it doesn't concern me as I find the commute very easy.