Whether a larger diaphragm is better for microphone capsules depends on the type of sound you're aiming for and the specific environment in which the microphone is used.
The diaphragm in a microphone capsule is responsible for capturing sound waves in the air. Generally, the larger the diaphragm, the more sensitive the microphone becomes, which can result in better audio pickup and clarity.
Larger diaphragms can collect more sound and suppress noise more effectively, often leading to improved sound quality. So, if your application requires high-quality sound capture, choosing a microphone capsule with a larger diaphragm can be a good option.
However, in noisy environments, a diaphragm that is too large may also pick up unwanted noise and cause distortion. In such cases, selecting a microphone capsule with an appropriately sized diaphragm is crucial to avoid sound degradation.