There is no optical advantage in the 10x42 swarovision over the SLC other than sharp edges to the very edge of the FOV. The SLC optics are just as good and its a more compact binocular, I also prefer its ergonomics over the swarovision. The SlC is also technically brighter because it has less lenses than the Swarovision.
The sweet spot in the view of the SLC approaches 90% with just a little pincushion distortion added to eliminate the possibility of rolling ball distortion. The new tend in high end binoculars is to add just enough pincushion to do the job or use field flattener lenses more moderately. Premium binoculars in the past had excessive pincushion distortion added.
The flat field extra lenses in the eyepiece's of the Swarovision cause the whole FOV to be sharp but at the expense of causing rolling ball distortion when panning (objects leaving and coming into the FOV are moving faster then objects in the center of the FOV when panning) (also called Globe Effect). Some peoples eyes are very sensitive to this.
You need to look through a Swarovision enough to decide if the rolling ball bothers you before you buy one.
You may also prefer the ergonomics of the Swarovision over the SLC.
IMO the top two premium 42mm binoculars at this time are the SLC and possibly the new Zeiss Victory SF (just introduced). Yet to look through one.
I like the SLC better than the Zeiss Victory HT (awesome brightness).
The new Zeiss Victory SF is an attempt to dethrone the Swarovision.
It has flat field lenses but not taken to the point to cause rolling ball. It has 92% transmission in the whole visible range (SLC 91% so a tie) and a 360 foot FOV in the 10x42 (better than anything else) as well as a excellent focus design.