I think the best knife is the knife that best suits whatever task needs to be accomplished AND is portable enough that you will actually have it on hand when you need it.
For me, whenever I leave the house I
always have my SOG Aegis assisted opening knife with black tini blade and black handle.
I love this knife because it is extremely light (3.4 oz) yet has a 3.5" blade. It's so comfortable/light to carry I actually forget I have it on me, I almost washed them in a pair of pants because I didn't notice I was carrying it when I took the pants off.
It's sort of funny, whenever I am with friends or family and something needs to be opened or cut, they always ask me for my knife because I have the Aegis on me 100% of the time.
Here is a review from the ubiquitous nutnfancy: