I'd say the Delica is a slightly better cutter with it's thinner blade (no surprise). I also prefer the looks. I'd say this is the one to get if you can have only one.
I like the longer handle (large hands) and longer blade of the Endela better for general cardboard and recycling duties. I bought this knife specifically for those tasks. It lives in the kitchen drawer, ready to destroy the next unsuspecting box. The Delica lives in the garage.
The finger cutouts on both handles are similar, and neither fit my hand well. I have to choke up far fowards to get 2 fingers in the large cutout, or far back to align with the cutouts. Puzzling, but I can work around it. My assumption is that the Rockjumper, with its Stretch-like handle, will fit my hand better.





