Which SEO tools do you find most valuable for competitor analysis?

SEMrush and Ahrefs are unbeatable in competitor analysis. You can even add MOZ if you want.
 
I have been using Ahref and SEMrush to research my competitors since 2015. I did not try/prefer any SEO tools in the meantime. What do you guys use to spy on your competitors? When mentioning any tools please let us know why it is more exceptional than any other tools out there.

Thanks for your time.
Do you purchase these tools from official website or buy from BHW marketplace for cheap?
 
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