Well why not both? :p

This is Biostars, not microstars. Don't expect us to suggest anything else than bioinformatics :P

When you say courses - do you mean degrees, masters or what? Ive done a degree in microbiology and a masters in bioinformatics. So Im strong in the biology department, and still a baby in the computer science field. I suggest go and research the common jobs available for bioinformaticians.

Im becoming aware that a masters (even with distinction) in bioinformatics is not enough yet to make me as competitive as id like in the job market without experience and/or a phd - many of the jobs i want require more education in computer science than i have. Many require extensive computer knowledge to build tools to service biologists needs. If that suits you, then a degree in computer science / bioinformatics is better with a masters in biotech or a biological field after.

Can you think about this question again?

You are asking about two completely different fields. If you like microbiology then you can certainly learn/apply bioinformatics in your research but not the other way around (theoretically you could, if you started working in a lab after learning bioinformatics).

you should start looking into labs that study the microbiome. that would feed both of your interests in microbiome and bioinformatics :)