If you are searching for the best PST file splitter software, I would like to suggest using the MailsDaddy PST Split Tool. This application does not change the originality of the data during the splitting process. Also, it provides multiple options to break large PST files like date, size, email ID and folder, you can choose any. It supports all Windows OS and MS Outlook versions.
Read more: https://www.mailsdaddy.com/pst-split-tool/