Fat side well trimmed and then fat cap up. I do Brisket in my WSM with water in the bowl, but the self basting of fat cap up helps, I think. But then what do I know...
Bo Compton in Mesa, AZ, KCBS CBJ
Weber Ranch Kettle, BDS Mega, OTS x 2, Weber Platinum
18.5 WSM w/Stacker from ProQ, 22.5 WSM, Reverse Flow Lang Clone 80 butt capacity mounted on 25 foot trailer with attached awnings
LFSA RED Thermapen,
And 1 2010 Victor brand Hot Dog Cart