What bagless vacuum cleaner is best for hardwood floors?

A vacuum cleaner is not the best way to clean hardwood floors so there is no best option. hardwood floor surfaces are best brushed with a fine haired natural fibre sweeping brush, which pushes debris ahead of it while holding it. If a vacuum cleaner may be used to suck up the collected debris once it has been collected into one place, then ANY machine that can suck it up through a tube will do.