The Canon EF-S range of lenses are designed specifically for the Canon APS-C range of cameras.
The Canon 1300D is an APS-C camera and therefore, the Canon EF-S 10-18mm Lens will work perfectly with this camera. What you see through the viewfinder is what you will capture with no further undesirable cropping.
If you were using this on a full frame camera such as the Canon 5D, there is a possibility that some EF-S Lenses can extend deeper into the camera and with a flange of 44mm, may extend past this distance and hit the mirror. An EF-S lens may also result in an image that will have all four corners blacked out.
The obvious drawback of the 10-18mm over the 18-55mm stock lens will be the reach.
Other noticeable drawbacks of such a lens are as follows;
• Distortion and stretch when subject is too close
• Prone to vignette specially if you use filters which happen to not be the thinnest available
• can produce soft edges
On the other hand, besides achieving a greater FOV, the 10-18mm STM lens has a Stepper motor which has an advantage over the 18-55mm when it comes to video as its almost silent.