OCCT is an actual test. Your results say that OCCT gives a better test in 10 min than Realbench, Aida64 and Prime95 do over hours of hot CPU stress.
Realbench can serve as a test at the real-world application level if that's the level of stability you need. Many need more. OCCT is a better test for more critical levels of stability. Aida 64 is a good source of information and as a realtime monitor, but useless as a stability test. Prime95 is plenty stressful, but doesn't check the answers to catch errors in its calculations. That's OCCT's advantage - it checks the math.
The only test I think is better than OCCT is y-Cruncher. It runs just as hot as Prime95 or OCCT, but will catch errors or pass the test in about 1 minute with a 6-core CPU - and those include memory errors.