Mentor Boost Mod+ or MemoryGel "Standard" HP? (Photo)

My goal: fake look, most importantly lasting round C shape upper poleness. I know I'm in the grey zone for a lift, but decided I don't want one for the moment. I currently have Saline Mod 350CC, 2 babies and big weight loss after. With my width, surgeon estimated 600cc Mentor memory gel HP to fill the space. I later discovered the Mentor Boost, took a pre-op appt. To achieve my goal, should I go for the Boost mod + (more diameter &cohesive) or regular HP(more projection)?