What do you find the most useful SEO Report?

I'm curious to hear what people find to be the most useful SEO Report and why?

Personally I find the Ahrefs Organic Keywords report from Ahrefs really useful when run against my competitors. It allows me to identify keywords that they're ranking well for that I may not have thought of previously. As it also gives approx search volumes and keyword difficulty (with the normal caveat about any tool's search volume and keyword difficulty estimates) it also gives me a good idea of what keywords to prioritise for manual review.

I always forget not to post first thing in the morning. Clearly there aren't enough British early risers on the forum