Most generally, American speakers tend to use the English-style plural, while British (and related) speakers favor the Latin-style. Of course, there are those words whose Latin-style plural forms are non-negotiable on either side of the pond, such as bacteria and criteria. And there are also those whose English-style plurals are universally preferred, e.g. compendiums, apexes, etc.

Most generally, American speakers tend to use the English-style plural, while British (and related) speakers favor the Latin-style. Of course, there are those words whose Latin-style plural forms are non-negotiable on either side of the pond, such as bacteria and criteria. And there are also those whose English-style plurals are universally preferred, e.g. moratoriums, apexes, etc.