your question depends on what the audience is. if you are talking about the value contempory audiences put on it, obviously it is more accessable and easier to understand. more people would prefer to watch the movie of Blade Runner (and walk away thinking of the confusing twist at the end) than have to sit down for MUCH longer than it would take to watch the Blade Runner film, and have to go thru the, maybe, confusing concepts that aren't clearly defined as BR's are. you have to remember that, when writing essays such as these, the contempory audience DOES NOT have to plough thru the many pages of waltons letters to get to the good stuff. they can easily put it down, then go spend about 2 or so hours watching the film.
it's more believable, as the person above me said (sorry, i should really have written down ur name) as humans have progressed to the stage that, with scientific advancements, we could create life. in fact, we are (though thru different means). we can make infertile women pregnant with IVF, create clones and other stuff i can't think off the top of my head. so the modern audience can relate to it more.
good luck! hope i've helped a bit