There are significant differences between Geography and Geometry spatial types in SQL, and I'd by no means accept the "default" without determining what storage format best fits your data needs. Without going down the rabbit hole of this is better than that, check out Spatial Data Types Overview for a detailed description of both. It boils down to your choice of coordinate system and desired precision of measurements. Personally, I'm a fan of geography....
You can also look at the table from Management Studio. If the database reports the geometry column as an integer, then it's using SDEBINARY geometry storage.