Badge, there's no ineffective 12 ga slugs out there. All do well if inserted properly.
The sabot slugs leave longer blood trails, but we still collect the deer within 100 yards or so.Since the 2 870s I use for hunting like Winchester and Brennekes, I like those blood trails Ray Charles could follow(G)...
All this is assuming that one is shooting at game within range. There's no 200 yard slug guns or ammo,and darn few 150 yard combos. Most folks would do well keeping their shots within 75 yards or so,but the limiting factor there is them, not the equipment.
Best thing to do is to testabunchaslugs, and go with the one that's most accurate in YOUR weapon.
I posted a thread some time ago about setting up for slugs, I'll try to bring it back up again....