There is no need for site space to accommodate steel members as they are usually erected immediately upon delivery. This allows the enclosure of facades and floors at a very early stage. Concrete frame usually requires very large site space to accommodate such items as concrete batching equipment, storage of materials, cement, fine and coarse aggregates, steel reinforcement, steel fabricating areas, formwork storage areas, formwork making areas etc. Remember - quality control issues, concrete cube tests, mix design and concrete cover on reinforcement. Fire protection, reinforced concrete has its fire protection built in.
Steel frame requires fire protection.
Historically, concrete was used to surround steel members to give adequate fire protection, but this added to weight, slowed down operations, need more site space, became costly, needed more substantial foundations etc., therefore not so advantageous. Also the use of painted fire protection to steel is very lightweight. Most buildings undergo change throughout their life-span. Buildings often require extension and alteration. Steel framed structures are easier to extend than concrete framed structures and so future usage may be a deciding factor.