Now I am working on PhD proposal and I have around 4 topics. I am stuck here for two weeks and don't know how to proceed and decide on one topic. I am thinking about criteria like: job opportunities, my personal interest and professional development. They are almost the same for my 4 topics.
My question is: how do/did you decide on your PhD topic? what criteria do/did you use to select one? what criteria you do/did NOT use to select one?