The iPad Pros (12.9 and 11) are the oldest iPads still available. Months later Apple released newer iPads that were not M1. The iPad Pros are listed by MR as "don't buy.".Not sure on this point, the M1 and future processors have higher transistor counts so performance will go up (unless architecture changes the way instructions are completed). Only time I can remember an older product being better was AMD Bulldozer being worse the Phenom X series.