The sway bar set up on the spool mount K is much better. The bar runs through the K frame which improves ground clearance and keeps you from using the sway bar or mounts to find parking blocks. The factory sway bar allows for larger front tires than the biscuit mount K style factory bar, although if you use an aftermarket sway bar that’s not as big a consideration. And the mounts themselves for the sway bar are better on the spool mount K.
The spool style engine mounts can’t tear apart like the biscuit mounts can, although you can buy aftermarket biscuit mounts that won’t separate. On the downside, with the spools you can’t really shim the engine mounts to move the engine a bit if you need header clearance somewhere. With the biscuit mounts adding a shim to one side or both to move the engine a little is easy.
For me the sway bar mounting difference makes the spool mount K my preference, but I use large aftermarket sway bars and wide front tires.