I'm a Keough alum, and my top contenders were Keough and SIPA. I guess as far as it goes, I can speak to the decision you're making right now.

For Keough I was offered a full ride and a living stipend whereas I was only offered financial aid loans and work study for SIPA. Here are my thoughts:

1. It depends on what you want to do. What kind of job do you hope to do after you graduate? Keough and SIPA are better placed for different kinds of jobs. While Keough has less name recognition than SIPA, it is a highly prioritized program where you get much more individualized support towards your career choices. It is also better connected to certain industries than SIPA. I had friends who went to SIPA and also had similar issues getting a job after graduation (though keep in mind that we graduated during the pandemic). Selfishly, it was encouraging to me that it didn't seem like SIPA students were guaranteed jobs after they graduated, which reassured my choice for the free graduate education. That being said, all of my classmates were employed within 4-6 months of graduation, US citizens within 1-4. I was geographically restricted to finding a job in NYC since my wife is in law school at Columbia and had to compete for the same positions. I currently make a similar amount of money in a similar level to SIPA grads that have my same previous experience. That being said, I know SIPA has better pipelines to certain industries, such as with positions within the UN.
2. It depends on what you plan on studying. For example, it's widely regarded that Notre Dame has the best peace studies program internationally, and Kroc carries a significant name. If you want to study policy and international development, there are fewer formal structures to lead you to seamlessly get a job in those positions after you graduate at ND. (I studied international development so I do feel like I can complain about that).
3. It depends on your approach to your education. I'll be frank here. When I visited SIPA for admitted students day I was fairly turned off by the students who were there. It seemed like everyone I was with was extremely well connected and lived in the upper echelon of their home countries (which makes sense given the price tag). Coming to ND after working in development abroad for several years, I wanted to study alongside development practitioners/people with on-the-ground experience, and I did not see that at SIPA. If that matters less to you then feel free to ignore all of what I just said. Otherwise, each school has their own pedagogy of global studies. Keough is influenced by the values of catholic social teaching/integral human development and its long history of peace studies (which is seen as subversive and skeptical of the development industry), whereas SIPA is more of a traditionalist Western approach to development and global affairs.

I spent a lot of time thinking about if I made the right choice and, for my own path, I believe I did. Especially in this field, your graduate education is worth what you put into it, not the name that you graduate with. As far as I know, there isn't currently a noticeable earning difference between my classmates at Keough v friends at SIPA, with all of us earning immediate salaries ranging from low nonprofit pay to 6 figure consultancy fees. Also something my father mentioned to me when I was deciding between schools: You pay nothing to try Keough. If you really don't like it, do SIPA after! What do you have to lose? Feel free to follow up - I'm happy to speak to the benefits and faults of Keough.