Depends on what action you take. When you click the "+" on the right side bottom of hangouts, it asks if you want a new video call/new sms/new group/new conversation. If you select "new SMS", it will send SMS. All others will default to using the Hangouts service (IM).
If, you are using Hangouts to handle Google Voice SMS/Calls, then your "SMS" will be sent over the data (WiFi/CellularData) connection that is available (not over the cellular connection)
The easiest way to figure this out is to just set Hangouts as your default SMS app - and try it out. It is reversible, so you don't really risk anything.
Edit: I don't use Hangouts for my carrier SMS, so if this information is inaccurate, hopefully somebody will correct me.
If, you are using Hangouts to handle Google Voice SMS/Calls, then your "SMS" will be sent over the data (WiFi/CellularData) connection that is available (not over the cellular connection)
The easiest way to figure this out is to just set Hangouts as your default SMS app - and try it out. It is reversible, so you don't really risk anything.
Edit: I don't use Hangouts for my carrier SMS, so if this information is inaccurate, hopefully somebody will correct me.
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