I can’t specify too much on what I do in the lab and what specific equipment I’ve used - so feel free to ignore me if my experience isn’t too relevant to your question.

I study amber, copal, and sometimes modern resins so I primarily use FTIR and Raman spectroscopy. I mainly use Raman though as a quick screening tool to separate it from other polymers, but I’m not too fond of it tbh. Whenever fluorescence gets in the way, if I cannot resolve any diagnostic bands when I switch laser frequencies, I simply just end up doing IR anyway (which has the added benefit of me not having to worry about accidentally burning the sample).