Depends on the movie, my mood, and the cost.
Now, for example, I would never wish to see
Lawrence of Arabia again except on a big screen. You
need the theatre sized screen just to get the entire impact of the film.
On the other hand there is
My Dinner with Andre -- doesn't matter if it is on a small screen at all and, in some ways, is preferable there.
There are also many films that I
wish I could see on the big screen again, but I know I will never have that chance, or there is at least very little chance. But I would rather see than not see the film, so I will gleefully opt for small screen.
And others that I regret seeing altogether...
So for me there is no simple answer to the poll.