As no ones mentioned it....
Only get a loach if you want a loach. I have had a few species of loaches- mainly clowns and yoyos, and not everyone does a good/any job at eating snails. Yes i'm afraid it comes down to the individual, probably a 50:50 chance maybe less and as wyldfya said, would also depend on snail species. I currently have 2 clowns and 2 yoyos that are doing a pretty piss-poor job of eating snails in my snail ridden tanks if you ask me. Unless you are happy manually removing just leave them, unless you have a planted tank, most species won't do any damage.
Only get a loach if you want a loach. I have had a few species of loaches- mainly clowns and yoyos, and not everyone does a good/any job at eating snails. Yes i'm afraid it comes down to the individual, probably a 50:50 chance maybe less and as wyldfya said, would also depend on snail species. I currently have 2 clowns and 2 yoyos that are doing a pretty piss-poor job of eating snails in my snail ridden tanks if you ask me. Unless you are happy manually removing just leave them, unless you have a planted tank, most species won't do any damage.