.44 was the standard in AK for decades, but judging by what I see in the shops and in the field, are now being substantially out sold by the 10mm. It’s hard to even find a good revolver on the shelf anymore. Neither one gets used on bears often enough to establish any real track record.
Like lots of people up here, I’ve got both. Carry the 10mm when I need to be able to work, as it’s flatter, lighter and takes up less space. Might be a consideration with a bow? The .44 with 320’s still gets carried on coastal salmon streams at times. Although I’ve stared down bears with both of them many times, I’ve never had to pull the trigger, and odds are strong you won’t either.