The Death Guard ofc. All shall feel the inevitable touch of the Allfather. Also still waiting on that answer about gods and the narrative Ivan. Or well a simple "i cannot disclose that" or "we havent thought about it/reached that point yet".
The Thousand Sons and their constant thirst for knowledge has always appealed to me. Ironically, the World Eaters and the berserker hordes of Khorne in general also appeal to me.
If I had to vote it would 1k Sons. I love world eaters, but Thousand sons are just too damn cool looking. No one really likes Emperor's Children apart from the wub wub noise marines ._.
Although Tzeentch is my patron God i dont like the Thousand Sons at all as they are literally the opposite of Tzeentch in almost every way (seriously, brainless suits of armor is the opposite of change) but i do so love the Berzerkers so i went with World Eaters
Indeed it is, but our reasoning (Nurgleites in lore) why we call him the Allfather is cause he governs over all things. No matter how big or small, strong or weak, timid or infamous, all have felt the touch of the Allfather in some ways. From a simple cold to a death bringing plague, all are Nurgles hands that pass over the mortals. Even corrosion of the unliving matter is his domain. Plus the whole notion where he governs over both death and life. So the Allfather, the father to all.