The dixie slugs should be fired through a rifled barrel if I am not mistaken.
Since most folks with shotguns have smoothebores, I recommend the Brennekes...also, I realy doubt any animal is going to know the difference.
Fish and game in Alaska has long been known to use Brennekes...good enough for them is good enough for me.
Funny thing is this...for real penetration, those 'in the know' would prefer a rifle any day of the week and twice on Sunday...like a 45/70.