For your intended uses, it sounds like the 30 would be perfectly fine. They lived long and happy lives under Broncos for years. Some didn't of course, so the upgrade to the larger 44 was welcome, but not everyone needs one.
Larger diameter ring gear, some slightly larger tubes and axle shafts (I think?) and probably some other minor details, but unless you go to a larger tire and also are heavy of right foot, don't worry about if for now.
And if you find a good deal on a 44 later, you can swap your disc setup right over to it.
Paul