Honestly, with the gear you have I feel the best investment into your astrophotography hobby would be a cooled mono CCD. You have a solid mount, and two good scopes. Both scopes listed will probably be ok optics wise, but mechanically will frustrate you to death. When purchasing you also need to factor in collimation tools, and I would strongly suggest an OAG and more sturdy focuser.
I know you wanted someone to tell you which one is better, optically they will both suffice, but I honestly believe that both scopes will let you down mechanically.
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