Whenever I find two products that are close, I like to email or call both companies and ask some questions - say about sizing and applications. If a company just gives me minimalist answers to get me off the phone, I go elsewhere. If they give thoughtful responses asking me for more details, I figure these guys like their product and want their customers to be happy.
I have no idea how good a response you will get from either of these companies. I can say that if you call Hsu or SVS to use as a baseline, they will "do it right"!