Which is the best way to submit to directories?
Manual submission is the best approach because your approval rate in the directories will be very poor when you make use of automated submissions.
What difference does it make to the directories whether you use automated submissions or manual submissions?
It is not without reason web directories recommend that webmasters use manual submission services because automated submission tools are used extensively by people that spam the web. Using such tools spammers submit to multiple categories in the same directory and damaging the integrity of the web directories. So in an effort to keep spamming under control web directories do not easily approve submissions that are automated. So if your service provider makes use of automated submissions then you will not get your money’s worth.