To echo what several others have posted, up until about 10 years ago, I did a lot of revolver shooting with both an S&W Model 29 6" and an S&W Model 57 6".
In terms of power, there is not a lick of difference in performance within the normal range of bullets between the two cartridges with the exception that the 41 Mag has a little flatter trajectory a litte farther out. There is a better bullet selection for the 44 and heavier bulets are available. In reality, there is not a lot of diference between a .429" bore diameter (44 Mag) and a .410" bore diameter (41 Mag), nor is the recoil difference even very noticeable with heavy loads for each cartridge.
I too would venture to guess that a lot of the 44 shooters have never shot a 41, so have no valid way to compare the two other than what they read.
For whatever reason, the 41 just never caught on and never gained a great deal of popularity when everyone could shoot the same gun as Dirty Harry - the Model 29 - before Dirty Harry discovered the Auto Mag. During the 1970's and 80's, quite a few people were pushing hand gun hunting, and both cartridges were used to bag some very large and dangerous critters.
Either cartridge will work for the intended task mentioned above, and the game will not know the difference.
For those who have great ambitions and believe that tackling large bears, etc. with a 44 Magnum is a sensible thing to do, Skeeter Skelton, a long time advocate of both the 44 and the 41 in the 1970's and 1980's had the best answer I have heard for those folks.
Skelton wrote a monthly question and answer column in Shooting Times magazine. A reader wrote in and asked Skeeter what he would recommend for a heavy 44 Mag load for Brown Bear in Alaska. Skelton gave the reader several very heavy 44 Mag loads, but finished his response with words to the effect that if the reader truly believed he wanted to hunt Brown Bear with a 44 Mag that the best advice Skeeter could give is to use one of the heavy loads recommended - and when the reader ran across a large Brown Bear, to shoot the bear five times and himself once. That advice stuck with me and pretty well sums up what one can expect from a hand gun, even in the 41 and 44 Mag range.
As I got older (I'm still walking and talking and don't wear Depends), I got rid of both my 44 and my 41 Mags, but I still have several 45 Colt chambered DA revolvers and feel they will do all I would ever want to do with a large caliber revolver. To me, wanting to shoot the new S&W 50 caliber revolver ranks right up there on my list of things I want to do before I die with wanting to fall down a long flight of stairs.
Just my take on the discussion. (Fire away with the flames if you feel a need to defend your personal honor.)- BCB /ubbthreads/images/graemlins/wink.gif