I have both the Delica & Doug's mini grip. I like both knives. Both are under 3".

The delica rotates as EDC quite frequently because it is small, lightweight, doesn't show in jeans or dress pants and is very sturdy. The thumb hole makes it an easy open. Another poster said the thumb hole makes it wider which is true but I like a wider blade and the flatness of the rest of the knife is a plus for me, ymmv. The scales are grippy and the pocket clip can be switched for tip up or down if that matters to you but unless in the woods it's shoved all the way in my pocket. Most importantly the blade stays Sharp and is not too thick for finer uses. I like the blades slight curve. I have the plain edge. I have some combo edged knives but find the plain edge more useful.
I don't like the lockback lock. It is not the sturdiest design and can't be easily closed one handed. I clean out the pocket lint often to make sure it doesn't get caught in the lock mechanism.

Doug's knife is very sturdy. I like the shape of the blade better and the axis lock makes it easier to open and close. The axis lock is more bomb proof. I like the fact that the mini has a full liner as opposed to the full grip. The blade stays very sharp, it is a thinner design making it easy to use for fine work. I own Doug's full grip too but I find I carry the mini more.
I don't like that It is much wider for urban carry. The handle is ok but not as well made as the delica, I get bringing it in at a certain price point and it's not made to be a show pony, but I would have paid $10-$20 more for a better handle.

The delica sees more urban work and the mini grip spends more time in the woods.

Good luck with whatever you purchase.