Some things to think about are what kind of hunting are you going to do? Ground? Tree stand? Shooting bears out of tops of trees? 3D shooting? Normal hunting ranges from 0-35 yards? Or longer ranges? Are you shooting a slow arrow set up, say 220 fps, or fasts like over 300 fps?
With out knowing what you have and want to do with it it's hard to tell what would work best for you.
I use a Predator IV pendulum sight. I use a tree climber a lot and also hunt from the ground. I shoot a heavy arrow at 275 fps and my single pendulum pin is dead on from 0-40 yards no matter if I'm on the ground or 30 feet up a tree. No yardage estimate needed, no compensating for down hill angles, the only thing I need to know, is my target within 40 yards. It's a fixed pin sight if you are shooting up hill so knocking bears out of trees would take some uphill practice. Not the sight I want for that hunting but for WI. deer hunting it has not failed me in 8 years. I'm limited to 40 yards with this sight, but that's OK. A faster, lighter arrow with speeds around 300 fps the sight would be effective somewhere over 45 yards. If you need more range, it's not the sight for you. If your shooting slower than 220 fps, it's probably not the sight for you. The sight has an adjustment for speed which separates the Predator IV from all other pendulum sights. Sure beats a $300+ "Smart" rangefinder telling you what range to hold on for what pin to choose, forget it, it's already gone. lol I got 6 deer my first season with this sight and I can tell you I wouldn't have done near that well if I had to learn yardage and multiple pins. It's the only thing that hasn't changed in my set up through 5 bows in 8 years.
American by birth, hunter by choice.