Use a HELOC to pay cash on property?

Newbie question: If you have a HELOC where you can pay cash for a property and rehab (BRRRR), is there ever a case where you shouldn't do that and explore other financing options such as hard money, private lending, or a down payment with a conventional loan, etc? What would be the advantages/disadvantages of doing an all cash deal vs a down payment with financing? Thanks!