GPS only Apple Watch can do Everything a Cellular model can do as long as your iPhone is nearby.
GPS vs Cellular
https://support.apple.com/en-us/HT205547
https://www.imore.com/apple-watch-cellular-vs-gps-whats-difference
Cellular Apple Watch model costs more initially for the cellular radio. Plus, if you activate the cellular, by adding the Apple Watch to your iPhone cellular plan, it is an approximate $10 per month U.S to your cellular bill.
Your iPhone carrier Must support the Apple Watch.
Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service:
https://www.apple.com/watch/cellular