I was also able to compare the 115gr WWB to a 124gr Speer Gold Dot (not the +P load). The Gold Dot penetrated one more water jug than the WWB.
Yes, there are a whole lot of more important factors than the bullet to take into account, but since we aren't talking about those factors in this thread...
The improved bullet technology is apparent when you shoot them side by side and compare them. Granted, since they were different grains, it may be somewhat of an apples and oranges comparison...
However, the bonded Gold Dot appears to peel like a banana, allowing it to keep more energy as it travels, whereas the WWB JHP appears to simply flatten creating more drag, therefore effectively bringing the bullet to a quicker stop.
I like a bonded bullet because it eliminates core-jacket separation, which allows it to retain more weight and gain more penetration.
I carry 124gr +P Gold Dots in my Glock 19. They are more pricey than WWB, but they are not breaking the bank. I think I was able to buy something like 200 rounds for like $30-35 a few years back, IIRC. It was a pretty sweet deal.