Sometimes it depends, I have 2 boards set up right now that are both about 9" wide (I'm real tall, it makes sense for me I swear!) and one has Indy 169's which are the proper size for a 9" board and the other has 139's which are for boards about 8"'s wide.
I find myself riding the one with the 139's simply because it's a lot lighter, I do, however, land primo much more using them.
Just something to think about, it's probably not as big of deal cause you're not riding stupid boards like me though...