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Troy,
They each have their strengths and weaknesses. Flip mirror works fine on the imaging train as long as you can still achieve focus however the field will typically be narrower than your finder. Telrad has no magnification so won't be able to see dim objects - just the star field. You don't need to have your eye near the telrad to use it so it's not like the finderscope issue for overhead objects. Right angle finder puts the eyepiece in a better position for viewing however as you point out you can't view through both eyes. I've ended up using all three (telrad on the main scope and the right angle finder and flip mirror on the guide scope).
You're welcome to come and give mine a try if you want.
Peter
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