What? In OT you elect to receive every. single. time. You score a TD first, opponent is toast. It's why some argue Shanahan should have gone for the TD on 4th and goal rather than kick the FG. A TD immediately ends the game.
Not anymore in the postseason. Even if the first team gets a touchdown, the other team still gets a possession. If it’s tied after both teams have had a possession then it goes to sudden death.