Any preference on connector/wire size?

Thinking either 8mm or 10mm bullets on the board or short (<10cm) single 6AWG or dual 8AWG cable.

Was thinking it would be nice if they could bolt together in a stack and have a parallel bus bar that can run between them to cut down on cables. Then a single cable can connect them to the battery. (Or at least that is what I want for Triforce due to the limited space) This option would require to use bullets soldered to the pcb to be practical.