Get your slimy, webbed phalanges off ma boots!
My preference is ties only.
We like the tie breaker marker to matter in decisions but be as unobtrusive as possible.
Lighter players in particular often prefer to simply pass it each turn as it is a bit easier.
The rules also state that, at the end of a round, you should give the Tiebreaker Marker to the player with the lowest score. What do you do when two or more players are tied for lowest score (which happens very frequently with pub scoring)?