What tools do you use in academia to jointly review a thesis? I am giving a thesis for review by several supervisors, who will comment and request changes. It's written in LaTeX, but I don't want to bother the people involved with having to compile that themselves. Instead, I would send a PDF as it'll represent the final product most accurately.

My question is, what can I use / do you use for the review process?

I know they can just comment inside the PDF, but maybe there is a tool that allows everyone to see everybody's comments?

If supervisor A and supervisor B disagree on something or don't want to have to correct the same mistakes, then it'll be easier for them to see the other persons comments. Kind of like a shared Dropbox file, but something that's a bit smarter about keeping the history of all comments.

Have you used anything like this or do I just have to rely on built-in PDF highlights / notes?
This is a good question and I don't want to discourage you, but let me explain what you will likely find most of the time.

They each already have a preferred way of giving you their feedback and some or all of them will not want to use whatever tool you choose.  Since they are doing you a favor, you will need to respect their preference.  For instance, I prefer to take a hard copy and a red pen and go to a coffee shop or library in order to focus.

Also, when I review a thesis I do not want to see comments from other reviewers before I form my own opinion.