Is there a reason it seems like breast cancer awareness is given a higher priority?

Because (recycled): It is a common cancer, has an effective screening, can be treated successfully if detected early, and affects patients in a very visible way. There are many other political reasons as well. It may feel unfair to those suffering of other cancers so we need to be advocates for all patients with cancer regardless of the type. Sorry for the recycled answer but it's still true.