Lior:
CE is the same as WC. WC is offered at a discounted price, so it is much cheaper, while providing the exact same service.
As far as which as the K-9 vs. Web Chaver debate, they are different. I use WC and K-9. K-9 has the advantage of preventing seeing things that I shouldn’t by accident, for example pop-ups and other ads. Web Chaver keeps me from intentionally going to websites that I shouldn’t.