The best way is to share one account as you can both log into the web version at the same time, though the only risk is that you can both edit/delete anything in the cloud. You can also access the same cloud account from the desktop (using the Change user button if needed from cloud view).
I've also seen some breweries set up separate accounts and they use the separate account just for collaboration and only put the data in that separate account that they want to share with each other.