The Alabama Supercomputer Center transitioned its flagship ASA-X system from Slurm to Altair PBS Professional to improve reliability, supportability, and system utilization. Administrators faced challenges with Slurm documentation, upgrade stability, and advanced scheduling configurations. PBS Professional provided mature features, extensive documentation, professional support, and advanced scheduling flexibility. The center adopted fairshare scheduling, improved reporting, and implemented customized queue wrapper scripts for ease of use. GPU isolation, job monitoring, and workload efficiency improved significantly. After deployment, users reported a smooth transition with minimal disruption. Overall, the move delivered better hardware utilization, simpler administration, and long-term ope

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