I have a Delica, which I think is a good utility knife. The Endura is great as well but as noted above, the larger size can be intimidating towards others.
Now, while the Delica is perfectly fine, I do think that Spyderco offers a compelling alternative: the Caly 3, as it gives me the impression of being in (even) higher quality with its dual steel liners. I also love the leaf-shaped blade. Check it out.
Another interesting alternative for pure slicing is the Centofante 3. Roughly the same size as the Delica, the thinner blade makes for a somewhat less sturdy yet superior slicer.