When I was new to research, one of the most frustrating things my mentor would say was, "Choose whichever works."
I often tell my students that two scientists in a lab lead to three (or more) potential strategies on how to tackle a research question. In the beginning of your research experience, your mentor will tell you which approach to take.
At some point, she will expect you to weigh the options and choose a strategy to follow. You might not pick the right one the first time, but it’s important that you don’t let that possibility stop you from taking the leap.