James Baldwin's influence on Ta-Nehisi Coates's Between the World and Me has received considerable attention from critics and reviewers, but most have confined their commentary to The Fire Next Time, which Coates used as a model. An original argumentative thesis comparing the book with "This Morning, This Evening, So Soon" might focus on the similarity between the narrator's trepidation at returning to the United States and Coates's view that white supremacy is endemic and invincible in America.
Your argumentative thesis might, therefore be something along these lines:
Both James Baldwin in "This Morning, This Evening, So Soon" and Ta-Nehisi Coates in Between the World and Me show that there is no way for a Black person to remain in America and escape from white supremacy.
This is different from the way in which the qualified optimism of some of Baldwin's nonfiction, written in the midst of the struggle for civil rights, is often contrasted with Coates's bleak pessimism. The contrast between genres in this thesis statement reinforces the similarity of the authors' perspectives. The narrator of Baldwin's short story is able to be hopeful about the future, but everything he remembers from the past militates against that hope. Coates, confining himself to lived experience and facts, cannot justify any such optimism.