Eastbank , old joke. But it offers the opportunity to cite some of the differences between the two.
The Black bears will quite often run off if you even yell BOO at them , and in the lower 48 they are seldom very large nor are they often aggressive in nature.
A Brownie on the other hand is the biggest ,meanest Junkyard Dog one can encounter , and armed with multiple razors on all four corners and spikes in a large oral cavity..............and he KNOWS this. If he decides to take exception to your presence it's not a 300 lb ( that't middling large by the way) black bear you're facing , it's a 700 lb plus ( mostly plus and perhaps a 1000 or over) top tier predator that once the adrenaline is up is ***exceedingly*** hard to stop.
Common sense will keep one out of trouble with 'em in the first place ,*for the most part* , but there are those times when it cannot be avoided and most folks have ZERO concept of how fast the big bears can move and how hard they can be to stop.
Can a handgun be used , yes in a pinch and yes I have had to do so. Is it ideal..........NO...........again NO........there is NO handgun that is anything less than a compromise , and there is ample reason that most folks in the Far North consider .44 mag with stout loads to be the *minimum* , yeah , yeah I've heard the myriad stories as regards other calibers and YES I stopped one a few years back with a .45 acp , note that it was all I had on me at the time , it took a whole mag and repeated head shots , the damn bear DID knock me on my ass as it died..........and it was only a two year old and only around the 600 lb mark.
Situational awareness , stay the hell out of the berry patch when the bears are feeding ( so to speak) can carry one a LLLLOOONNNGGG way in avoidance of such scenarios.
In the above case I was equipped for social work (taking a trip to town) , took the garbage out prior to leaving and got jumped from the brush line.
NOTE that after that incident said brushline got pushed back another hundred feet and social work sidearms are personally restricted to city and social usage , a Bear DLP sidearm is utilised until a presence within the urban environment is achieved.
Another thing that folks do that is out and out stupid , if you're fishing and the bear comes along and wants your fishing spot and/or fish , *Give it the hell up* , there are more fish and more spots. And if you take a deer , caribou ,moose etc...............best have your head on a swivel while you're field dressing your game and a rifle AND sidearm to ready hand , this goes TEN times over if you're by yourself. And NO it's not a " myth" that in some locales these bears treat a gunshot as a call to dinner. Come to it , give up the damn deer , there are more and you really don't want the hassle and paperwork of the DLP scenario.