How do i setup a PC to Mac workflow

i have Access to both a pc and mac and i’m wondering what is the best way to setup a workflow between the two while using a external hard drive?

The best solution probably is the asset server, but it does require some kind of server running and of course the team license.

If you don’t want to go with a network solution, you can of course keep your project on the external drive and plug that into the PC and Mac respectively.