Ok,I'm on the job(12 years)and a knife nut.You see everything and anything.Many carry sak's, Buck 110's, whatever knife the already own, a hunter is likely to carry his folding hunting knife ect.
I carry a 50/50 blade one hand opening,clip style knife,more and more are slowly going in this direction

.Right now I switch between a BM 710,and an Emerson CQC7a.In the past I have carried Spyderco Endruas and Delica and Cold steel voyagers ,all make good knives for FF.
CRKT is just coming out with a FF version of their m16 knife,looks very good.
I used to carry a Spyderco Rescue in my bunker coat pocket but lost it at a fire.This is a REAL possibility and one reason guys don't like to spend a lot on knives.Many find the Rescue to single purpose,they often want a point(we got shears to cut around people)and don't care for an all serration knife.
As far as opening with gloves on the Rescue was better than most however,our gloves are very thick,they get wet a lot and tossed on a pipe in the boiler room to dry,so they are very stiff.I can't even bend the distal joint of my finger with gloves on let alone open a knife.Always took my glove off to use a knife.
You can't go wrong with an Endrua,Voyager,or the M16/ff knife get the 50/50.Good enough to get the job done and one can always move up from there,if the "bug"bites
Check Blade magizine an issue or 2 back they did a piece on knives of ground zero.By FAR the best piece I ever read about FF knives,the only one I ever read where I thought the author had any clue as to what we need and do!!!Most talk about cutting seatbelts which is so far down the list,I imediately know they don't "walk the walk".
Ok heres what I forgot,this is for a structural firefighter,wildland or crash,fire,rescue(airport)may have differant needs.
I also break uses up into 3 parts.
1.around the firehouse use,whatever you cut at home we cut at the firehouse,rags,cardboard,food ect.
2.self defense,a few years back we had 5 people killed within 100 yards of our firehouse,more than once have I watched the "ninja"dressed police jump out of vans and case the drug dealers across the street.
3.on runs(calls)use,cut a lot of tar paper and plastic,burned carpet,matterses and sofas,cut rope and electric cords that people use to tie gates shut with(getto padlock)
You see its much more than one would think.Good luck and WELCOME.