What is the biggest difference other than one being old and the other new? Been playing with the PS Classic 6.1 for 10 yrs and have really no complaints, but I want to get an updated stick. I've been looking at the 18x20 version to get a bit more control. Is is worth the price to "upgrade" or just stick with the classics. I am a heavy hitting all courter, moderate top spinner, prefers a stick with no power, control is most important, strings my current sticks at 68lbs for added control.