Don't really have that many knifes, but each one tends to serve it's purpose.
This is pretty much all my knifes.
For every day use i tend to always have me Skeletool with me.
Not really to fussed about having a knife, but the screwdrivers and pliers/wire cutters have come in handy no end of times.
If i'm out on a day hike i'll swap it for me charge TTi, as the TTi comes with a wood saw.
If i'm out over night then i'll take my Mora Neverlost
At work i usually carry a work knife, it's handy because it's automatic opening.
Lastly i have a cheap crappy Ram G-10B knife for fishing, so it's not the end of the world if i drop it overboard or it gets ruined by the salt water.
Only a cheap knife but it's still holding up fairly well after 7 years odd of abuse (apart from the bent tip).