I think it all comes down to perspective.
To the Theme Park enthusiast MW is the 'purer' park.
To the average punter DW offers far better value for money.
I think the parks know that and cater for it, MW goes the extra mile to theme and create the total experience, DW bang on and on about how many rides they have.
What we need as punters is for the two parks to close the gap on each other by responding to the strengths of the other.
DW has started to do that by lifting its game on park presentation and by putting pressure on MW by adding attractions.
MW has Seaworld to keep dragging punters in via the multi-park tickets but will no doubt start to respond to the constant knocks that it lacks attractions by adding some mid-range options, as always beautifully presented which will in turn pressure DW right back.
I think the parks are both excellent in their own way but hope they stay at each other because ultimately the punters will benefit.