Between these two it seems very simple to me. If you want to shoot always off a tripod, get the RB. If you want to carry it around on a neck strap and shoot handheld, even occasionally, get the Hasselblad.
The OP describes himself as an 8x10 Shooter. I figure shooting the lightweight Hasselblad handheld would be a welcomed change every once in a while. I know it is for me.