Buy both.. then you'll never be left wondering..
I have the Handi 45-70 and the BC 45-70.. The Handi's prime duty is pine thicket hunting. Which it does very well. The slug gun will give the Handi a run for its money, giving only accuracy at longer ranges to the 45-70. I honestly think you really cant go wrong with either, having the 45-70 a better bullet/load selection.
I plan on getting H&R's 24" rifled heavy slug gun some day. Looking at the muzzle is like looking at the main turret guns of the USS New Jersey.
In the aerial picture below, the red X's mark my general stalking grounds on the family farm and neighboring farm lands.
The 2 X's on the left are in a thicket so dense that you can only see 20-75
ft depending on if you are looking against the rows of trees or with them. You have to crouch down to walk in most of it.
Blue X marks where my dad and uncle sit as I drive deer out of the thicket. ..they're just too old to be driving deer.