I've only thrown an Afterburner but have drill hundreds of Rhinos for customers.  The Afterburner is stronger down lane than Rhino by my estimate of at least 5 boards depending on rev-rate.  The rhino is smoother overall throughout the lane and a little less ball overall.  If you are looking of a direct replacement for your Rhino the Afterburner might be a little bit to much.  If want something you can open up the lane a bit more with and move a little deeper then the Afterburner will probably fit the bill for you.