In case you haven't seen it, in this 16 ratchet comparison video these were the top 7 scoring 3/8" flex head ratchets:
1. Olsa Tools
2. GearWrench 90
3. GearWrench 120XP
4. Stahlwille
5. Wera
6. Proto
7. Craftsman
The Cornwall wasn't tested and the Craftsman took the most torque before failure.