Business Rule vs Script Logic for KPI calcs

Hello Experts,

Trying to figure out the best way to calculate some of our KPI's. We have set up a few KPI calculations through script logic but I am running into issues when trying to create the logic to calculate Operating Profit %. Is it recommended to use business rules for calculations or script logic? Our system is set up for a Periodic data load yet several of our calculations need to be available when looking at either Periodic or YTD. How can this be accomplished without having to keep our calculations within excel?

Thanks,

Michelle