Publishing Open Access is ALWAYS the best option for you and your research. The process of making the outputs from research available online for free with limited reuse barriers has so many benefits and increases the reach and impact of scholarly output on a global scale. By its very nature, Open Access is concerned with equity and increasing the dissemination of scholarly literature to a world wide audience. Making your research accessible via Open Access enhances your online visibility and significantly increases the readership of your work. This is especially important for those who are in less privileged positions who may not have the means to access paywalled journal articles, for example.
Fundamentally, information should be seen as a public good and Open Access seeks to ensure that all those who seek to engage with the outputs from research can do so. Open Access helps to create and sustain an inclusive, collaborative and Open research culture.