The one on the left is the old formulation, last updated in 2019. Yes, it's API SP, but these oils were ahead of their time anyway. The one on the right was updated around May this year. They cut down on ZDDP slightly, and made some other changes that don't really matter to us mere mortals. As no one should run either of these for 10K miles in most engines, let alone 20K miles, go with either. It won't make any difference. If the marketing psychology works on you, then go with the "Extended Performance" as it's "better."