Shadow Chaser vs Guillotine Cross for casual pvp

[bumpn]

im starting a thief class and don't know with to use. I like the outfits on both of them but I hear SC is more for pvm but sinx is pvp. so I can only assume GC is a step up?
im seeing tho that SC is more magic related than gc is

[Malarija]

shadow chaser is a pretty fun char to do in pvp

can copy 2 skills, one of them can be literally anything, and all the masquerades to disable enemies

[junimir]

if you want a killer type, imho, GX is still the best because of their skills and their new poisons. SC is a good support than killer.