I would likely watch the first episode of each, because a one-sentence description is usually inadequate. In fact, I'd likely watch the first two or three episodes because pilots often are not entirely representative, since they have to introduce so much in a short time.
You never know when a so-so concept actually has the right cast that makes the show special, or a writing team or director that understands just what the show should be about. I mean, look at "Firefly"--a literal "space-western." The concept kinda reeks, but I think most posters here would agree that even the pilot episode showed such promise.