Let's Make Robots!

Maxsonar ez1 vs srf05 vs parallax ping

Hi

I'm new to this forum and i would like to know a few things.

Which one of the following ultrasonic rangefinders do you prefer.

I know that the ez module is designed for indoor environments but i would like to use my robot outdoors

as well,do the ping and the srf05 would outdoors as well.

My robot is going to be a basic obstacle avoiding robot for otudoor and indoor use.

I know the ez is accurate to about 1 inch,what about the accuracies ofthe srf05 and ping but this is really not going to