There is no definitive answer to this.
Each building is assessed by each insurer as to risk.
And each insurer asseses risk differently.
Age, condition, fire services, number of previous claims, excess etc all play into assessing the risk.
For one of my buildings we found the best value was to engage agood broker to do the leg work. We made sure that the risk assessment document was accurate, and even provided information to the insurers to show we were low risk