While these sources main point is to research where money goes and argues against quitting your job to donate time it does not infer, imply, or make a case, for or against, volunteering vs giving money.
Yes, a donation is better then quitting your job to join the peace corps, if you are under qualified. [note: peace Corp does not take random folks. They look for specialized professionals. https://www.peacecorps.gov/volunteer/volunteer-openings/]
Please watch video I linked to above. Donations are great; So is volunteering a bit of your time in your community to educate, or at least incurage, folks to strive for betterment.