The phrase "backs wrong horse" refers to making a bad decision, but there are several antonyms or opposite phrases that can be used to describe making good decisions. These include "backs the right horse," "made the correct decision," "choose wisely," "picked the winner," or "made the smart move." Each of these phrases describe making a choice that leads to a positive outcome or result. It's important to carefully consider options before choosing a path, as the wrong decision can have significant consequences. By backing the right horse, individuals can increase their chances of success by making informed, thoughtful decisions.