Your opinion/experience that AP Lang and APUSH are easy is far from universal.
Don’t confuse AP Language and Composition with AP Literature. AP Lang is a composition course
Students cultivate their understanding of writing and rhetorical arguments through reading, analyzing, and writing texts as they explore topics like rhetorical situation, claims and evidence, reasoning and organization, and style.
If you are a very high performing student, is there a reason not to take both?