^^ THIS
I've done some training with knives. That's enough to know that I never want to be in a knife fight.
For utility, I carry a Kershaw Cryo. I've carried a knife since I was in grade school. I've never been happier with a knife than I am with the Cryo. It's easy to open and close one-handed, even with my preload gloves on. It has holes tapped so you can move the clip for both left and right hand carry as well as tip-up or tip-down carry.
I use it daily at work. Sups have even borrowed it on several occasions when they're working close by. I can't imagine not being able to bring it to work. Our center has absolutely zero security, though. No guard shack. No badges. No fence. Anybody can walk right in with anything.