I would actually like to have a 2 post over a 4 post. I am getting a 4 post because of the way I see using my space. I like the ability to move the 4 poster to a different place in my shop. I just don't want mine to be secured in one spot. If you are going to do wrenching on an everyday basis, I think a 2 poster is more versatile. I just know that I want to be able to move mine at this point. I agree with Grigg's points and think stability on a two poster is fine too.
