Here is a goal: What are the ingredients to make Kansas City Brisket?

Which way makes more sense to accomplish this goal?
(1) 10-12 lb whole "packer trim" beef brisket 1/2 cup brown sugar 1/2 cup granulated sugar 1/4 cup salt 3 TBSP chili powder 2 TBSP paprika 3 TBSP black pepper 2 TBSP ground cumin 2 TBSP garlic powder 2 TBSP onion powder 1/2 TBSP cayenne pepper 1/4 tsp cinnamon 1/8 tsp cocoa powder BBQ sauce, molasses-based (if you can't get a Joe's, Jackstack, or other Kansas City-based BBQ sauce, Sweet Baby Ray's is "comparable")