The H150i Pro is a 360 AIO:
Fan Airflow: 47.3 CFM
Noise Level: 25 dBA
Fan Static Pressure: 1.78 mm-H2O
The H115i Platinum is a 280 AIO:
Fan Airflow: 97 CFM
Noise Level: 37 dBA
Fan Static Pressure: 3.0 mm-H2O
How H115i Platinum better than H150i Pro?
- The Fan Airflow showed in H150i pro is for individual fans, the one showed in H115i Platinum is the sum of both fans (2 x 48.5 CFM each). This means that fans of the are more efficient ( 47.3 CFM for the H150i < 48.5 CFM for the H115i Platinum)
- This contribute to a higher Fan Static Pressure that's why is higher than the H150i pro. Fan Static Pressure is a measurement that indicates how the air that flows from the fans pass through the radiators little spaces. Higher values means better because it demonstrate that air is passing all those little spaces. Lesser values means that air cannot pass through all those spaces making the system not so efficient. (1.78 mm-H2O for H150i Pro < 3.0 mm-H2O for H115i Platinum)
These 2 advantages contribute to higher noise but you will choose it because you want aesthetic. The H150i Pro only got RGB in the pump, but H115i Platinum got RGB lights in both fans and pump.