Ricoma's Chroma embroidery design software is the easiest to use for digitizing because it includes automated digitizing features. Chroma is a standalone digitizing software that can export all embroidery files, allowing you to use it with any machine. Such as Embrilliance or Wilcom. But if you are digitizer and want to make logo embroidery for your customer you would need DST file.
There are many online embroidery digitizing companies to provide you some useful digitize images.