Can't comment on the Spyderco, out of the ZT's, what it boils down to is the style you prefer. The 562 is wider and fills the hand. The 393 is slimmer in both blade and handle. The blades are close to the same length. Of course there's the difference of the slabs. Personally, I like the G10 cover on the 393. The 562 has more options of changing the presentation slab. I've got a Ti slab from Midnight Sun Industries. Whitty at USA Made Blade has done some stunning anodizing on both knives.
The real answer is to get one of each so you don't beat yourself up wondering if the right choice was made.