I liken the difference to the difference between a Cadillac and a hot rod. The Roll20 OGL sheet is very comfortable, easy to use and has all the technical bits hidden. The Shaped Sheet is the hot rod. The hood is down, the parts are easy to get to and tune to your specific needs. Or perhaps the difference between the original Mac and the MS-DOS machine. Neither one is a wrong choice, they just appeal to different users. Although I have no numbers to back this up, anecdotal experience suggests that the OGL sheet is almost certainly the more popular of the two. At least it generates far more forum traffic. Also, there is closer development cycle time between it and marketplace Compendia and Adventures. The Shaped Sheet often lags a bit behind because changes to the Compendium format are developed expressly for the Shaped Sheet and vice versa. Conversely, the Shaped sheet usually has more regular upgrades and enhancements. Although the author sometimes goes on short hiatuses, his development cycle has been close to once a week at times. If this is not a concern for you, and you like to automate and tinker, the Shaped Sheet is likely your choice (It's my personal preference--the Shaped script's ability to import and expand spells is invaluable). If you want more of a plug and play experience, the OGL is likely your choice. One thing to note that may help you make your decision: The Shaped Sheet is better at importing a character created by the OGL than the other way around, though neither is perfect. You will need to make adjustments. The Shaped Sheet does convert Monster Manual and similar Compendia without a hitch, though the PHB and Charactermancer have yet to be accounted for. The author, Kryx, may decide that he has no interest in doing so. I have not mentioned the Community Contributed sheet, because as far as I know, it is no longer supported or under development.