To help you best decide which login type to use in your email software/app please see our help article here
If you already have a login set up and wish to change it from POP to IMAP login or vice versa, we advise that you first backup all emails/settings in your email software/app so you can easily revert if needed. Then simply set up a new account in your software/app with your desired login type and once done, you can delete the old account from your software/app. Please see here
for all the settings you'll need to get set up.