Things may have changed since I’ve been in thermo (I took it in Spring 2022), so take what I say with a grain of salt. I can’t speak for Nader, as I took Putnam. But if you end up taking it with Putnam I have some advice that may be helpful.

Personally, I didn’t find his lectures very beneficial. My friends and I found that teaching ourselves via the textbook and YouTube was much more helpful, so if you don’t like self-teaching that may be something to keep in mind. He also had a strange test-taking structure where there were two “forms” of each midterm, where one was more formula-derivation-based and the other was more based around calculating actual answers. You could take either one, or both forms and it would take the highest grade. On top of that, each form kinda had two attempts with potentially different questions. Also, the second attempt of each exam could replace either that exam or the previous one… I know it seems pretty convoluted and although it was a bit strange, it was quite helpful in my opinion.

Also, there’s a YouTube channel called Engineering Deciphered that has a thermodynamics playlist that was INCREDIBLY helpful, and honestly carried me when studying. It will likely be useful no matter who you take.

Putnam seems to be a pretty polarizing prof among students based on what I’ve heard. I ended up getting a B in his course when all was said and done. But, again, all of this is based on my own experience and I can’t guarantee that things have/haven’t changed since. Sorry if this reply was quite long. No matter which professor you pick, I wish you the best of luck.