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I've used almost every OAG available over the years. Never found the Holy Grail but a couple came close.
For 2" focusers (and or Newtonians etc) the Lumicon Newt OAG is very good. It has a large movable pick-off prism.
For SCT threads, the Celestron Radial guider is hard to beat. Allows almost 120 degree rotation of the prism without moving the camera.
OAG is very different from using a guide scope, but when mastered will give much better results.
BTW I use a QHY5 for guiding, and a Vixen flip mirror system modified to a 70/30 beamsplitter for spectro work.
Hope this helps.
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