Out of curiosity, what are you doing with these?
I worked with high-power EV chargers.
Each system had 4 RPi 4s. (Some due to 3rd-party hardware, some powering touch displays).
The main system started out with 4GB, but 8GB was more convenient for developing.
The systems generated a massive amount of metrics that got buffered in memory.
8GB memory is convenient when your only alternatives are SD-card and EEPROM.
Well, if that's true, have to agree raspberry pi may be better than esp32.