Don't know of a website that will compare the two software packages.
This is one of those questions with NO concrete answer -- if you ask 50 different people this question you will get 50 different answers. Most people in this forum will probably chose LabVIEW due to its graphical nature and rapid VI development. Matlab has quite a few more analytical toolboxes than LabVIEW. I guess the answer depends on what you are trying to program.
I have used both quite extensively and prefer LabVIEW.