The model 44 was an attempt to make a sellable .44. That was about it, nothing really special about it.
The raging bull has a whole concept behind it, which includes: strength, reliability, and accuracy.
The raging bull can handle the hottest ammo out there reliably, and because of its weight, it handles it with not a whole lot of recoil. The rubber grips they put on them give a really solid grip to hold onto, and cushion very well. They design process that went into the raging bull was right on. I do like the vent rib mounting system, which I just added a scope to my .454RB this fall, accurate and solid.
With the advent of the raging bull series, I really see no reason to buy the older model .44. Ok, I guess depending on your preferences, the older .44 does have a different style, and is lighter.
A good stainless steel raging bull in .44 mag is a hard value to beat in the large revolver market.