Suggestions for incorporating wireless capability to a simple sensor based project
For choosing any wireless medium for a project, you should consider it's long term effect. Certain parameters to be considered are-


Power Consumption
Range
Susceptance to noise or interference due to nearby modules already present
Ease of upgrade for future purposes.
Cost( best use of already available modules)
If the modules are mobile or battery-powered, You should consider power consumption. Bluetooth BLE can be a good choice to be considered.
For range, if the modules are very close within meters, a simple module of RF433MHz will work fine. For long-range LoRa or Zigbee can be considered.
If you have already installed some wireless modules nearby using the same frequency may cause interference. This is also applicable for many Bluetooth modules. Generic wireless modules like nRF24 or similar RF modules can have channels overcome this. On the other hand, Wifi uses frequency hopping so it easily manages through many devices.


Which kind of technology you should use depends on the particular use case, and what you want to do with the data after receiving it. You can receive the data on your mobile phone or any microcontroller.
I would suggest using a Wifi module for connecting to your home router or LAN. Then you can access the data across all your devices using its local IP address. This architecture uses your already available modules and has upgrade options. You can also easily use multiple nodes in this manner for data transmission.

Although it depends on your use case and your solution may vary greatly.