Does anyone have a good tip for literature about different varieties of rangtong (empty of self) and shentong (empty of other) perspectives on emptiness?
Judging from your answer to this, it sounds like you're more interested in different varieties of Madhyamaka and how they treat the subject of Relative Truth and Ultimate Truth. As for Relative Truth, some schools say that all phenomena exist as nominal designations, while others say that to assert any existence or non-existence of phenomena is a mistake - although we may go with the conventions of the majority for practical purposes. As for the Ultimate Truth, some schools says any assertions about it are empty but the Truth beyond assertions is not empty, while others say that this was an assertion as well - and the best thing is to avoid any assertions.
In my opinion, as long as you get what the argument is about there is not much sense in nitpicking the exact words. However, some traditional teachers - particularly in Gelug school - insist that these polemics facilitate analysis and therefore deeper understanding of emptiness.
There are many works comparing Madhyamaka flavors - it would be excessive to list them all here.
One work have I recently read that comes to mind is The Ri-me Philosophy of Jamgon Kongtrul the Great: A Study of the Buddhist Lineages of Tibet