Both companies are well known companies that make great products. However, my personal favorite when it comes to minimalistic cases would definitely be the incipio Feather case. I use it on my 3GS right now and it is amazing! The matte-like finish on the back is a plus as well. But, you really can't go wrong with any of the cases you've mentioned either; trust me, they're well known brands when it comes to iPhone cases.
Here's the link:
http://www.myincipio.com/category/00...ries_.feather/