Currently, I'm officially declared as a Biology major, but I don't care to take any Ecology and Evolutionary Biology and upper-division Botany courses, although it would only amount to two courses total. However, Mycology, which is under the Botany department, is an elective for Microbiology, which is understandable due to the pathogenic nature of certain fungi, so it would really be just one course, but a Microbiology major would allow me more opportunities to take almost all Microbiology courses my university offers. Also, I always figured I would double (or triple) major when I enrolled in university, so now I am trying to pursue a double major in Chemistry and Microbiology instead of Chemistry and Biology.
Since you are deciding between these two fields, try to contemplate on your abilities and priorities. Even if one field may be easier than the other, would you truly enjoy those classes, especially its upper-division components? For example, some people find language arts and social sciences extremely easy, but quite boring at the same time, so they do not end up enjoying these classes. I personally find it rewarding to challenge myself. If you pursue Microbiology and put in the necessary effort, you might even surprise yourself that you could do well despite your initial suspicions. I feel that with most, if not all subjects, the key to an A is the amount of effort you put into the class. Of course, there will be certain classes that you need not put in any effort at all and still receive an A.
Also, if you want to minimize your school work, try to formulate a 4-year plan (or however many years you're planning to complete your degree) and see which one would allow you more time to conduct research, volunteer, shadow, work, and of course, to have a social life. But if you're interested in double majoring, a 4-year plan would also be necessary.