Should I use affiliation? I am going to send a manuscript for publication. I made the work in my vacations (while having a fellowship) with my own resources and, although related, it was not part of my research plan.

My fellowship is over. I still teach at some university but I am not paid for doing research. However, the institution prefers being the affiliation.

I am trying to figure out what is more convenient, publishing with or without affiliation considering the following:


I am in need to find work as researcher in any country due to the almost null probabilities of make research in my own country. I tend to think that a paper published with no affiliation should be good received by the employer, due to it shows real interest in the subject (because of doing the work for free in free time). But I am not sure about how this is considered around the world.
Maybe, in real life, it could be more difficult to publish with no affiliation.
This is more in the realm of opinion than fact, but I would always use the affiliation. This gives the reader a bit of context that will most likely increase your credibility. If the reader is open to believing what you say even before beginning reading the paper the mindset will be different than if it is just a bit of work by a random, completely unknown person. 

Of course, once you become Stephen Hawking the affiliation is no longer needed. 

But for the rest of us, knowing that we did the work as a faculty or staff member at the University of the Universe (or whatever) will give us that opening that allows a fairer reading of the work.