I would connect to the ESC’s and keep the main voltage away from the FC.
As well the FC is equipped with a OSD not feeding direct battery voltage into the FC may also provide a cleaner FPV feed.
Feeding the ESCs battery power directly could have a better results then pulling all those amps through the FC first.
I think at the end of the day its your choice. The FC can take the voltage.
Personally I would attach my battery input to the ESCs