It scales better (for example in VRP we had case were OptaPlanner did in 5 minutes what Google OR-Tools did in hours), it can handle fairness and load-balancing

It scales better (for example in VRP we had case were OptaPlanner did in 5 minutes what Google OR-Tools did in hours), it can handle fairness and load-balancing constraints (= non-lineair constraints), it supports real-time planning (= changing the problem while solving it) and continuous planning, it uses OO input and constraint written in plain java (no math equations) and it integrates with the Java ecosystem (think REST, Jackson, JPA, Quarkus, Spring, ...). YMMV, I am very biased.