I own one of each.
The ProKnows was the first I purchased, but I bought it before I knew any better, and really never liked the look of it. I took a Dremel to it to shape it more to my liking, but it still never really fit my face well. I bought a Howle and loved the look of it on my face, but was frustrated at the lack of filler and it's inability to hold a shape. My solution was to Proknowsify the Howle by using expanding foam insulation and then carving out to fit my nose. It worked really well and I am extremely pleased with the result.
My $.02.
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