This video was originally only meant to be about Sliding Slash but I included Charged Slash in the end since Sliding Slash is basically a shortcut for Charged Slash. Maybe I'll do Drill Slash next.
I didn't discuss the pros and cons of using Sliding Slash over Advancing Slash, so I'll do it here. Sliding Slash only excels at closing medium to long distances, it doesn't do as good of a job as Advancing Slash in short distances; SnS rarely needs to cover a huge distance, and you already have falling shadow and shield bash for those, which makes Sliding Slash redundant most of the time. You might think its counter-like properties can give you the edge over some fights. Still, it's also redundant in that department as Backstep already gives you the same amount of i-frames, is easier to execute, and you don't even need to hit anything.
Song used:
Persona Q2 - Road Less Taken (Instrumental)