I would assume one wouldn’t upload faster than the other? I think sensor data is transmitted every 16 seconds. I would like the closest to real time as possible.
Each sensor transmits at its own determined rate for the console to receive (factory set...cannot be changed).
WH65 16 seconds (all-in-one Osprey type - 2 wing and 3 wing)
WH32 64 seconds (outdoor temperature / humidity)
WH31 61 seconds (indoor temperature / humidity)
WS68 16.5 seconds (regular anemometer)
WS80 4.8 seconds (ultrasonic anemometer)
WH40 49 seconds (rain gauge )
WH41 10 minutes (PM2.5 outdoor version on solar)
WH43 60 seconds (PM2.5 indoor version when AC/USB powered)
WH51 72 seconds (soil moisture)
WH45 60 seconds (5-in-1: PM2.5, PM10, CO2, Temperature, Humidity)
Each console just listens for these RF transmissions, whenever they happen as that is up to the sensors themselves and how they have been designed. The console then always has current data from each sensor. On each console the data will expire if there is no recent transmission received...basically a sensor that just falls out (dead battery, broken, out of range....etc.). Then the console will upload a complete set of the most recent data to any configured service. It uploads to Weather Underground every 16 seconds, but it uploads to Ambientweather.net/Ecowitt.net every 60 seconds (unless you change the interval to be longer). Same for other services if you choose to configure them; WeatherClould (10 min), MetOffice WOW (5 min), PWSweather (1 min), AWEKAS (5 min), or your own server at any rate you set.
The most real time data will only be available at the display console itself (for WS-2000) or on the WS-View app (for GW1000), and 3rd party software if you connect the GW1000 via its local network API for software like Cumulus MX, Meteobridge, Weather-Display. Also you can use WeeWX (via "Customized" server upload). The Weather Underground upload is pretty close though.
** Warning: The Ambient WS-2000 can only use Ambient branded sensors. The Ecowitt GW1000 can use Ambient or Ecowitt sensors as long as the frequency matches.