definetaly the SLCC if your going for concealability, i dont wear neck knives but the SLCC works awesome if you put one arm and your head through the paracord and wear it under your armpit.
it also works awesome IWB using the paracord for a slip sheath.(my personal favorite way to carry it)
the handle on the SLCC is nothing short of genius, before i got it i thought it looked kind of uncomfortable and hard to hold. but thats the farthest thing from the truth, it just locks into your hand!
it would also probably work good as a neck knife because its very thin (1/8" thick) has a small handle, and the wide sheath should keep it from twisting.
bottom line, the SLCC kicks serious ass, my all around favorite strider. and ive owned a few of em at one time or another (18 or 19 i think)