I really like the Telrad (but have not used the Rigel).
I have one on my 8 inch dob mounted reflector and also on my 12.5 inch dob reflector. I really found it uncomfortable to use the original finder scopes and so simply use the Telrad now.
I find the "bullseye" natural to use and would be lost without it.
I have recently mounted a red dot finder as a replacement for the small finder on my ED80 refractor...but have not had much chance to use it yet so I can not comment.
Clear Skies!
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