This is a personal choice depending on individual circumstances. For corporate sessions, photographing staff in the work environment is probably best, unless you are looking for publicity head shots. Then an studio session will work best. For families, if you have a particularly special scene such as a back yard filled with seasonal flowers or dramatic fall colors, or a stone fireplace that would be a great backdrop for a family photo, you probably want to schedule an on-location session. If not, then a studio session will work best.