Funnily enough "The Gods Themselves" themselves is my favorite Asimov novel. It's very memorable. Doesn't feel like an Asimov novel.

I would honestly go with "The Caves of Steel" as a "benchmark" Asimov experience, the first novel in the Robot series.

If you want to go for something a little bit outside of the Robot / Foundation series (and you've already read or reread "The Gods Themselves"), I would go for "The End of Eternity".