I think it's good to experience both, I think it's good to experience lots of things in altered states, I see it as a way to build our own CPD Points (Continued Professional Development) in a safe, progressive way.
Sometimes open eye visuals with the sunshine streaming through the window and like giving life a little extra sparkle.
Though with my blindfold on it takes me more inward, maybe a bigger journey, probably more emotion.
So I say do both, but keep going back to the blindfold as it makes you feel you are going deeper and getting further.