DVD Decrypter is a great bit of software for ripping DVDs. As your tests prove there is no difference between using 'drag and drop' and using DVD Decrypter.
There is a chance that you might miss copying the .md5 (checksum), .txt and artwork files if you only use DVD Decrypter but I'm sure you're capable of doing this manually.
So, feel free to keep on using DVD Decrypter!
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