OK, I don't own both... I can only imagine that the WW longbow would be one awesome longbow, although I have never seen or shot one. I would love to shoot one sometimes.
I can testify to the Black Widow PL being the best longbow that I have ever shot. It's not that the bow stands head and shoulders above all others that I have shot and loved. The little things is what takes the Black Widow PL to the top in my opinion. What I mean by little things is customer service, perfect finish every time on every bow, the perfect grip on every bow. Little things like having well over 100 years combined experience that is going into each and every bow and access to countless phone calls at our disposal. Other little things like an online archery shop at our finger tips, their items sale for cheaper than most anywhere, including manufactures. I don't think they make a profit on archery accessories, if so it's not much.
Are the Black Widows worth the extra expense? Well I say yes all day long and twice on Sunday. The old adage that says "you get what you pay for", the person who coined that phrase may have very well been talking about the Black Widow crew. Not that resale is a big issue, you almost never see used PL's for sell, but when they are available, the resale value is always very high and they usually sell in a days time.
Good luck in your search, I honestly feel you will be happy with either that you choose... Heck, check out Big Jim's Buffalo as long as you're shopping. He's one heck of a nice guy who happens to build fine bows.