3. "It's really more to do with eras and the music that was made" In response to In response to 2
I think Aretha is a better singer as a whole, and she has a much bigger impact and influence, along with more memorable songs as a whole, I mean "Respect" alone is one of the most known songs ever.
I enjoy Chaka's music more, mainly that late 70's and early 80's feel. "What'cha gonna do for me" is one of my favorite R&B albums ever, probably Top 5 for me. As folks here know, I've never been the biggest Motown fan, but a lot of Aretha's music was better and not as cookie cutter as the generic Motown hits we all know. Still, I'd pick Chaka's music for my personal taste.