If your child’s home school has a local CES, then it doesn’t really matter how that CES compares to a regional CES, because a regional CES isn’t an option. It’s local CES or no CES. All of the CESs changed to a lottery during Covid, so they’re all a different caliber now than they used to be.
The important thing about local CESs is that a high percentage of the top performers are clustered in the CES and no low performers are admitted. Kids who are high performers but have behavioral issues will be admitted, so it’s not idyllic, but the pace of the lessons isn’t glacial and much more advanced books are offered in reading. There will be more projects and less busywork.
The only thing that might hinder your child’s ability to leave a CES class for a regular class would be staffing issues. If the non CES classes are at capacity, it might present more of a challenge to move to one of them.