I am stuck between Slannesh and Khorne.
I love the bloodthirsters, and I have a super cool scheme in mind for the bloodletters (and three blood crushers sitting in my basement

)
But I love the look of some of the Slannesh units and the idea/feel of Slannesh in general.
Tzeentch just feels trolly and silly, although
LOC is awesome and Fateweaver is even better, pink horrors are pretty cool too.
Nurgle is just gross, so I would like to avoid him.
So for an assaulty army, which is easier to play? Khorne or Slannesh? More rewarding? Cheaper? Sadly, they don't like each other much so I can't combine them into a trans daemon force, but alas.
All help is appreciated! Thank you!
~Mikey