I've shot a number of each kind. They all have their own good features and drawbacks. Sometimes the sabots can leave enough plastic on the barrel walls that they don't load easily after a small number of shots, but there are times the non-saboted bullets can load pretty tough, pretty fast from the fouling buildup. Some guys claim one powder or pellet is worse than the other, so I've bought 777s and White-hots and the others, and one may let you shoot 8 or ten times before you have to clean your barrel, and the other might be about 6 or 8. Not a whole lot different, in my book. I'm certainly no expert in muzzleloaders yet, but I've adopted a policy of having three field rods and some rags, etc. when I go to the range, because you never know how many shots it's going to take before the loading gets tough. With the three rods, as soon as one starts to bind, I clean the barrel after that shot, and get back to shooting.
Now, as for bullets, I have to say that right now I like the convenience of Powerbelts over messing about with sabots, but I can't bear witness to their efficacy in the field on big game. My thinking on this is that a .50 Caliber bullet would logically have more punch than a .45 Caliber (used in the sabots) when it hits the animal. It's more than ten percent bigger in diameter, so that's a lot more surface area impacting the animal. I came to this conclusion after watching my 45/70 destroy a target,

after first firing my 30-30 at the same target. I haven't decided whether one or the other is more accurate yet. I need to do a lot more shooting and experimenting before I make such a judgement. Also, I've heard that some of the bullets don't penetrate or wound as completely as others. Muzzleloading doesn't seem that different from regular shooting, but it is!

To be honest, I think any one of the bullets you have there would drop a deer or elk without any problem, whether saboted or non-saboted.
If you'd like to get together for some shooting at the range sometime, I'm not far away. In fact, I was in Centralia this morning. Do you have any good ranges around there?
~ Jim ~