Hello there, hope you are doing good!

I would like to tell you that between Msc in data science and a diploma in data science you will have many benefits with the Msc as it is a full time course which will enable you to get real experience and more in depth education about the subject. The learning will be more practical and with a good profile you will be able to get better placements by pursuing Msc rather than a diploma.

Hope you found this answer helpful.

Good luck for your future!