Double door seals - exterior weatherstripping?

I've got Rod's book and know all about the magnet stuff etc... but I'm wondering how is the STC of exterior rubber weatherstripping vs 1/4" closed cell neoprene on double doors IF one were to go that route for an iso booth? Thanks for your thoughts. I will probably also double tear it anyways later with another layer on the door (ala Rod's book) I just want to get feedback on what would be better for sound reduction - standard exterior door rubber weatherstripping or neoprene. Thanks -CS

rubber, neoprene, edpm.. it's all that jazz. The rubber weatherstripping can be neoprene as wel.