Scariest Factions for Dune

Might have missed it, but it shouldn't be lost that the Witches are in the mix. It doesn't get much more Halloween than Witches.

We had a fight a week a go with moritani VS hark. Hark won by traitor call, moritani then assassinated a hark leader, and Tleilaxu then called Face dancer on Harks leader!

Design question about Dune: Why not give each player a "No weapon" and "No defense" card, so there are always cards used in battle (to prevent a certain type of meta-gaming). Also: how come the battle wheel hasn't evolved into the form-factor of a knife after all these years? It would be more thematic. "May thy knife chip and shatter" and all that. I picture an arrangement with a troop dial and spice dial gear (where the jimping would be on a real knife) that would increment a linear counter built into a crysknife-shaped shell (with a space for the leader token in the hilt). If I had a 3-d printer I'd whip one up and sell it on Etsy, but I don't. Maybe something for the Kwisatz edition?

If I plan to only get one expansion, which one would you say is the most fun?