Bad AP will give you bad result, but same can be told about VoIP in general.
QoS was designed to change this and prioritize voice.
Also new WiFi protocols enable roaming: 802.11KRV
So in short WiFi quality in customer place is bad that’s why it is worse ?
Add new AP and allow only wifi phones then you will have same environment as Dect and tell me again that dect is better. Next add Dect to new flor, because of wifi i can add next AP and add it to controller.
By default WiFi win but you need prepare correct infrastructure for it.
WiFi handset is more expensive but it not have shortage that dect have.
- Station limit
- range limit (hard to expand)
- old voice quality
- limit calls per base