[Kosmik Panda]

I have the HD 439 right now and I have been looking at some stuff from grado and how do they compare to the HD439? I am going to use them for walking to and from school and outdoors. I know they are open but do they leak alot that is really important. Thanks! Also where do the grados preform the best? 

 

[Mad Max]

Neither will isolate much, HD439 leaks less.  I've only heard SR80 briefly, but I would probably take HD439 over SR80, personally.
Can you try both?

 

[Kosmik Panda]

I own the hd439 right now I would have to find a place to demo the grados though