I think many of us who are Sussex / Kent fare prefer Gatwick as an start/end destination. What is interesting about AOTG’s observation about LGW / LHR as an airport to transit which I guess is very different to using an airport as one that may be closest to home and most convenient. If I was flying to DXB or beyond then the EK service is massively appealing. But if I had to transit either airport (and specifically a given Terminal at either airport) then perhaps LHR is better than LGW depending on lounge access / security and so forth.
My guess is it would rank something like (without having to switch terminals):
There would be some bearing on opinion depending which airline / lounge you may have access to. Ignored LHR T1 as closing soon.