Personal preference, together with cost assessment, should be your guide if you are needing seed on a bare lawn. Another option for lawns that are mainly good but have a few bare areas, is to core and overseed the entire lawn and spot seed the bare spots.  See our patented Turf Tamer in action Lawn Doctor Turf Tamer In Action

Power Seed on a bare lawn.
Full, even coverage guaranteed

Core and Over Seed on a bare lawn
Best for boosting lawns