Personally, I wouldn't bother trying to compare the two. I think it's important just to realize that WC was the art Lee had formal instruction in, so of course a large amount of his techniques would come from that system. I think it's also important to keep in mind that Lee never 'finished' learning the WC system under Yip Man.
Comparisons between styles is ultimately pointless. As many here have said, there is no superior martial art, just superior martial artists.
If the interest was academic, however, the best way to discover this is to spend time learning WC from a competent instructor. Since JKD is supposed to be a personalized expression of the martial arts, any comparison you make between JKD and WC should be unique.
Cthulhu