Interchangeable Core Lock System Recommendation

[Stuart Udis]

I’m planning to standardize the lock systems across my portfolio using a hierarchical key setup with an interchangeable core system. The idea is to have one master key that opens everything, building-specific sub-master keys, and individual unit change keys. For those who have implemented a system like this:

What interchangeable core manufacturers are you using (for example Schlage SFIC, BEST, or others) & why did you select the particular manufacturer?