I don't mind either - both are fattening to the nth degree but some things just need a dollop. Mayo revolutionised the chicken / tuna sandwhich. Potatoe salad! (though I prefer my potatoe salad with a drizzle of olive oil, sprinkling of salt and a bit of fresh italian parsley)
The best thing to hit our shelves is Peri Peri Mayo - dipping chips/fries into that is heavenly.
Which do you prefer?