The hot one. Where the Sunday Best Rub goes sweet and smoky, this one goes after you — layered cayenne, chipotle, and crushed red pepper, with just enough sugar for bark and not enough to scorch on a hard sear.
Combine everything thoroughly until evenly distributed. Leave the crushed red pepper coarse — it's there for texture and pops of heat, not even distribution.
Keep in an airtight container out of direct light. Give it a shake before each use.