Thanks for the reply. I'll stick with Kaplan.
There's a couple minor discrepancies, but mostly it's just one source includes extra information that another one doesn't. My orgo professor also didn't teach us a couple rules for some reason, so I have to fill in the blanks. I just have to spend extra time putting it all together, and I want to make sure I'm doing it correctly.
IIRC Chad's videos didn't really go into priority ranking or complex substituents. I think he also said that for compounds with multiple functional groups, the parent chain is the longest chain that has the largest number of functional groups, but my class notes say that the parent chain is the longest chain that contains the group with the highest priority.