In reality, I've almost never had the opportunity to toss a coin for ends - at grassroots level, there's almost always one end where the markings are more/less clear, or where one of the penalty marks is in a hole or clearly in the wrong place. Or where one end has a nice fence to stop any misses while the other has a long hill or dense woods for a ball to get lost in. It's only really once you get to stadiums that the two ends generally become consistent enough that a coin toss is needed.