infinite baffle vs paraflex subwofer + guide resources

Hey guys, I'm curious as to how infinite baffle subwoofer ensloures might perform against paraflex, generally speaking.

I'm working with the following 21" driver, for pro audio application. Also if there's any good guides for modelling these kinds of enclosures using Hornresp or any other software, would love to know it.

Much thanks!
 
Driver spec sheet
 

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