Widescreen.... but in complete honesty, with the average size of home TVs, even home cinemas (yes, even the tacky huge ones in the USA) , it makes little difference to me.
If I say Cinerama, CinemaScope, Vista Vision and Todd-AO, does that mean anything to anyone anymore?
Widescreen is cinema and cinema is in a theatre with a huge screen, the kind they really don't install anymore and even if they do, nothing is shot on 70mm anymore anyway. My favorite threatre as a kid was a 70mm theatre, that was "chopped in two" c1990. It was the last of the real kind of cinemas (that I could get to).
Film is dead for pro and hobby photographers, film has long been killed by video for home movies, and sadly, film also has it's writing on the wall due mostly to distribution issues. (Theatres already are screening fully digital copies of films.) If the format, whatever we are talking about, is better in more ways that what it is replacing, then I am all for it. So, I'm not a Luddite.
I can't explain the experience and I don't want to sound like a (my) grandfather (In my day...), but if you ever saw Lawrence of Arabia, The Great Escape, The Abyss, Close Encounters or the Star Wars trilogy on 70mm originals, then you will know exactly what I mean. A crowded theatre, a good print, good sound and a huge screen with better resolution and superior color that even HDTV - compared to even the best home units today..... it's like comparing an exquisite meal in exquisite surrounds with exceptional company to eating a can of cold, stale meatloaf in a smoky, beersoked bar.
Sadly, imo, the world has downsized for good something that need to be kept big - and we are lesser for it.
:2 cents: