[GTALUG] Samsung mobile phone A vs S series

Anyone here with Samsung Axx phones? How would you compare it against Sxx quality? I know Axx is for budget and Sxx is for premium flagship. I want this purchase to be my last. So, I'm weighing - new Axx models (A16, A36) - used Sxx models (S21+) (S20 is 4G).