Do Airplanes Fly Vfr?

Aircraft flying in the National Airspace System operate under two basic categories of flight: Visual Flight Rules (VFR) and Instrument Flight Rules (IFR).

Which is easier VFR or IFR?

IFR flying is astronomically more challenging than is VFR flying, but those pilots who achieve this distinction are invariably better and safer pilots, both when flying IFR and when flying VFR.

Do commercial flights use VFR?

No. It is prohibited under FAR 121 and every airline's Ops Specs except where an exemption has been granted. Such exemptins are not common at all, and usually involve sightseeing flights with larger aircraft or something like that. No one may fly under VFR above FL180 anyway.