I believe the recoil reduction in a ported tube does lessen the recoil.
I've shot most of the choke tubes on the market , and have settled with one , the Precision choke tubes from Ontario Canada, I have info on the product if you are interested.AAAAAA here it is http://www.precisionarms.ca/WebPages/SplashPage.htm ...BT

I like them with Long Sharp Spurs....