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We have both a 21E and 35Pan - I end up using both in my 16" DOB. I have a bit of a love/hate relationship with the 21E... For a start it's huge, second it's heavy, third it really shows up the coma with an F4.5 mirror, combination of a wide true FOV and the magnification... so then you need the paracorr - which makes it heavier again - Setting up the DOB with enough counterweight to balance this combo throws it out for any normal eyepiece.
Also for some reason I find it harder to see the full field with the 21E vs the 10E we have - I can't really explain that, except that you have to roll the eye cup down and really get your eye right in there, which just isn't that comfortable.
So lately the 21E has been spending more time in our refractors with the 35PAN doing the find stuff / wide field views in the DOB... However if there is a bit of light pollution or for some objects which demand both FOV and magnification it really does look amazing.
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