I've never handled a 16, but I think the 13 is just about the perfect folder design. I'm not fond of liner-locks, but everything else is great. Handle is very secure and comfortable, and the blade is useful and pointy. I always like clip-points, and this one appeals to me alot.
I think the 16 may have a slightly stronger tip, but they should be pretty close. I would assume that it, like the majority of Emersons, has a great feel to the handle aswell. I believe the 16 has a very similar handle design as the Comander, which is good.
I'd say get the one you think looks better. The locks are the same, the handles should both fit you similarly well, both have a clip-point, ect..