Both methods are good in their own way; it depends on your needs. If you’re an individual who only has a few EML files for conversion, then the manual conversion method is good for you, but if you’re someone who has a lot of EML files for conversion, then it would be difficult for you to convert them manually and it will take a lot of time so you can go for automated EML to MSG converter. I personally use BetaVare EML to MSG Exporter that allows me to convert multiple files at once and saves me a lot of time and effort. It also provides an earlier view of attached EML files before conversion to ensure the files are correctly attached or not. You should definitely try this for seamless conversion.