Totally different scopes. GLM focuses on controlling your internal landscape, Emperor on conquering the external.
They would stack really well together IMO, but Emperor works great on its own as well. It’s not too old and still has been updated to the NSE, ive ran it recently with strong results, and am actually thinking of pivoting back.
GLM works great for what it’s designed for, but likely does better in a stack for most people’s goals.

— though I never have