Hello Reem,

Both Microbiology and Biochemistry are entirely different terms and vast subjects as well.

If depends on your interest that whether you want to study microorganisms and their morphology and their entire life cycle or metabolism and chemical reactions in biotic components.

If we compare both then Microbiology is easier than biochemistry as it is a very vast subject.

If you mean which has more scope then I would suggest you to consider both subjects without bias and similarly if you mean in terms of getting good job, then either is fine.

Hope it helps.

Good Luck!