Price, schedule and floor to floor heights are all factors.
Cast in place buildings tend to go up faster and following activities can happen faster.
For example: with a steel building you have to detail/weld steel after erection. Then you have to install Q decking, rebar, pour stop and then pour the slab. Then you have to spray fireproof. All of this happens before you can start laying out interior partitions and start your overhead MEP roughing.
In a CIP building the slab forms are stripped a day or 2 after the slab pour. The shoring post remain, but you can start MEP overhear and risers you just have to work around the shoring post. You also can start your interior partition layout with the re-shores up. you can remove all re-shoring once the slabs concrete has reached 75% on its design strength. Working around these re-shores is not ideal to many subcontractors since it's sows then down, so depending on how your concrete mix is performing, you can have a floor complelety ready for interior wall's and MEP's 2-3 weeks after the slab pour.