I own both (or rather the 50/50 Delica and the plain-edge Salt 1 which is almost exactly the same form factor).

I prefer the plain edge because the blade just isn't long enough to make good use of the serrations. I would always snag the serrations when I didn't want them and when I did want them, it restricted the movement in the sawing action.

IMHO, go to the plain edge or full serrated.

I've carried the blade 2 ways. First, tip-up in the pocket and secondly horizontally, tucked into my web belt. Tucked into the belt is more secure and makes it easier to access the pocket but takes a bit more effort to put it back into place. Either way the knife is thin enough and short enough that you aren't even going to notice that it is there most of the time.