Here in the UK its usually Back 9, then 6, 3 & 1. If still tied Card Play-Off as Match-Play usually gets a winner.
Some Clubs are going on Front 9 but that is not very popular.

Actual Play-Offs are not a good idea for a full day Events as a party may have to wait several hours for the Play-Off. Take Qualifiers, first off, in clubhouse at 10am. By 5pm they are wanted for a Play-Off. Ugh!!!!!!!!