I’ve been using Nusach Sepharad for some time now. I’ve been evaluating my choice of Nusach, since I do not have an inherited family custom. So I want to pose this question, if one does not have an inherited tradition, what Nusach should one choose? What reason is there for choosing one over another?

Shalom, In absence of family tradition on should use the version of the prayers that is found in their community. So, if you belong to a Sefard community you should pray Sefard. If you are unsure of your community practice, you should approach your Rabbi for direction. In any cases of doubt, one should continue using whatever version they have been using until now, without changing, until the doubt is removed (by, for example, permanently becoming part of a different community). Blessings.