That depends how you like to play, i play with Agonizing Flames, Fallout, Felblade, Feed the Demon, Sigil of Chains, Fel Devastation and Soul Barrier.
I like the combo on Agonizing Flames, Fallout, Felblade. I jump into the mobs pull IA, FB i got 3 souls and pop SB 1.6M or 1.8M Barrier. Also with Agonizing Flames more AOE damage and heal since is fire damage.
Also i run mythic+ with prydaz and cinidaria.