The Hebrew order makes better sense of the OT. It therefore makes it easier for Christians to understand the Bible and see its beauty. But the ultimate reason why we should use the Hebrew order of the OT is that it is the order that Jesus used (Luke 24:44).
The word canon comes from the Greek kanon (κανων), meaning “rule.” The canon of Scripture thus refers to the rule of Scripture, identifying what is Scripture. But the issue of canon actually deals with two questions: (1) Which books belong in the Bible? (2) And what should be the order of these books?