ᐅ Two identical systems. Two different buffer temperatures! Which one is correct?

Good day.
Who can advise me on which buffer temperature settings would be more appropriate?
In our street, we have two identical buildings with the same heating system.
Pellets, 1000L (264 gallons) buffer tank, domestic hot water, circulation. Units and number of occupants are almost the same.

Domestic hot water runs at 58°C (136°F).

System 1)
Buffer settings on the tank:
- Top buffer minimum 45°C (113°F), top buffer setpoint 45°C (113°F)
- Middle buffer 56°C (133°F)
- Bottom buffer 52°C (126°F), bottom buffer off at 50°C (122°F)
(Buffer is currently charging)

System 2)
- Top buffer 50°C (122°F), top buffer minimum 60°C (140°F), top buffer setpoint 66°C (151°F)
(The sensor is slightly positioned lower to increase the volume available for domestic hot water)
- Bottom buffer 49°C (120°F), bottom buffer off at 58°C (136°F)
(Buffer is currently charging)
- There is no middle sensor because the top sensor is used (due to higher volume reserved for domestic hot water).

Now we are wondering which settings are incorrect, correct, or more ideal!

I hope this data is sufficient.

Thank you very much.