I personally recommend Hoya Pro1 Digital.
these are also very good but much more of a pain to clean than the B+W ones i have both
I haven't used Hoya's filter. I am just curious why Hoya's filter is difficult to clean?
I've been reading in this forum for a pretty long time now and just registered to answer that
I don't own any Hoya Pro1 but I'm using three of the Hoya HD filters and I'm really pleased with them...nothing negative to say 'bout them