I think that there may have been more sustained drama in The Outer Limits (I've got a full set of episodes I taped off air years ago but never got around to watching all of them).
The Twilight Zone had an "unusual situation" and maybe a twist at the end but not always a lot of plot inbetween.
That said, I'd probably turn on the Twilight Zone first if the two shows were aired opposite each other.
That'll keep you out of the corn field. You've won a free airplane ride with William Shatner at 35,000 feet.