32 is enough for now since we don’t have offline maps. The largest thing you could store is music for offline listening and apps are small in size. I wish they would give us 64 or 128GB version when offline maps become the thing.
Id argue 16GB is probably enough for a while given music storage is also limited in a way. 32GB would be better but not really required. Thankfully 8GB is gone, cause watchOS is bloated enough 8GB is no longer sufficient.