I am not too familiar with those sights. But I have heard good things about the Keller sight. It's been around for years.

I have a Vital Gear camelback pendulum. It's okay.... But I am looking at going back to a standard multi-pin sight. The pendulum is nice and does the job, but, it is noisy, rattles, and following the laws of physics and geometry, it can't compensate for downhill or uphill shots from a treestand.