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EI J Class much better than BA. But whatever floats your boat. I'd prefer a wide body on a long flight.
But why ?
What are your considerations because you realise the twin aisles are actually about moving a multitude in relatively short tube lengths.
This theres more personal space is simply rubbish !
With seat back IFE even the cinema benefits are declining .
And crew ratio is appalling on those larger planes especially in the back.
Really only thing that is a truism with twin aisles are that the aircraft tend to be more stable in adverse weather I suppose.
I'll also add perhaps its a generational thing to some extent many 20-40 year olds have grown up with expecting twin aisle on longer sectors.
Whereas the elders will have experienced the 707/DC8 or VC10 if they were financially able to travel longer haul.
All had very comfortable seats and that's the point.