It all depends. Kess v2 good clone used be ok for older ecus only, but now also work great with newer ones. and with a slave you will have to rely on the master for your maps whaere as if you have a master you can write your own or choose where you get them from.
Question: I need confirmation that Kess v2 v5.017 clone with K-suite 2.47 can unlock PCR2.1 without opening or removing the ECU from car, directly via OBD? And then read and write soft directly to the ECU?