In my opinion they are both excellent bullets, but they are both different bullet designs and will perform a bit differently as well.
I like the Partition for heavy boned or heavy skinned game where you need a really tough bullet, but one that expands as well. They have nearly the penetration of a solid, but do the damage of an expanding bullet. Very good on big, tough animals, such as elk, or when using a smaller caliber, such as a .25 caliber, on some of the larger medium game, like a large mule deer.
The Accu-Bond is a bit better for longer ranges as it has a higher BC and will also expand decently at lower velocity, like you would have with a long range impact. But they are still much stronger and will hold together through bone better than a standard ballistic tip will. I think they are great for the really fast magnums we have now, as they are tough enough to hold up through a high velocity impact up close, yet have the BC for long shots and will still expand as well.
I would take either on a large game hunt without question, though they each have their own high points. With the Partition, Accu-Bond and Ballsitic Tip, you would have a trio of bullets that will cover the full spectrum of hunting, with a tough bullet for heavy boned big game, a good long range big game bullet, and the ballistic tip for lighter boned medium game where you want more expansion and don't need to break heavy bone or rip thick hide. Combine these with a round like the 30-06, 7mm Mag or similar round, and you have a very versatile hunting rig that will take any medium and large game that the US has to offer.