What are the main differences between the three biotech websites? From a quick skim, it seems that Fiercebiotech and endpts are strictly superior to biospace for someone who is not actively looking for jobs in that space.
Sometimes one will have something the others won't, but really because biotech is "small" big news travels fast and just reading endpoints will get you pretty much everything.
I also like https://www.biopharmcatalyst.com/ if you're interested in the capital/investing side of biotech.