Is brazillian wax or shaving better if i'm prone to ingrown hairs and prefer to keep the area bare? how do i best prevent irritation?

Shave.: In general waxing tends to create more ingrown hairs, because you're pulling the hairs out by their roots. Shave, but use a single-blade or electric razor, not the fancy multi-blade models. You won't get as close a shave, but that's the idea; ingrown hairs occur when hair shafts are shaved below the skin line, allowing them to grow inward instead of back out of the skin.