Vertical and Horizanta projects planning

Hi planning planet,

i have a question, what is the criterias taking into consideration while planning for horizantal and vertical projects?

for vertical projects such as towers, for example we consider that 60% of the project duration is for skeleton but for horizantal like factories less due to the presence of E/M fixes.

what other basic factors in planning do u professional planners do? i mean even before developing the project like setting out the major milestones in the project.

Thanks