Can't exist a space marine section without this question. Who is the best primarch? best based on the personal definition: if for you is more important martial prowless its that, is the most important thing is the tactical genius is that etc etc etc
Fulgrim. He is HAWT, kills other Primarchs and then just to top it off fucks off into the Warp and now just has pure pleasure given his every desire. Sounds fucking awesome! Also my favoured Legion is the Emperors Children....
Sanguinius he gave hes life in battle against Horus even when he knew the outcome of it and Emperor could bring the heretic down!
im gonna say guilliman he always left a planet better than he found it and he saved the imperium after the heresy
For me, there's Sanguinius who gave his life to protect the Emperor, Lion (not dead yet) because he is the father of the First Legion, Lemann (maybe not dead yet) because he chased Horus with the Emperor into the Eye of Terror [insert badass music here], and Lorgar before he embraces the Chaos because he was pride to be part of humanity, and was very godly.
Hmmmmm, Lion sent him in coma with only one punch....yeah. But nevertheless, all primarchs deserve our full respect, that is all of the glorious loyal primarchs, not those traitorous heretic filth!