Maggotkin start up question

I got the "start collecting nurgle demons" box and a beast of nurgle. My question is should I go for a mostly blightking build or mostly demon build? Which is most viable. If I go blightking I was gonna go for lord of blights as my commander for head throwing fun.
Thank you so much for your time and input. P.s. I'm painting my nurgle bois in a frostbite colour scheme.