Depends on what you intned by "Best"!
If you get sick after more than two hours at a stretch in the air,
nothing can beat Indian Airlines who operates some flights which gives you a sightseeing tour of sorts of transit airports if you are (un) lucky).
For eg, their weekly flight from Kuwait to Madras in India via Ras Al Khaimah , Calict and Trichy. Very highly recommended for those first time flyers who never want their flight to end!Ofcourse you get some food on every sector so you wont go hungry!And of course you dont have to change planes and your baggae has more chance of arriving with you, since it doesnt leave the aircraft once stowed.
And for all those claustrophobics who hate crowded airports nothing can beat the Kuala Lumpur International Airport. Acres of space and dozens of gates but hardly any airlines to use them. You dont get a luxury of a gate being used for just two flights a day in many airports don't you!
Cheers
RSO