From measurements I'd say the HD560s would sound better after EQ because the DT700 Pro X seems to have a cancellation null in a section of the treble that can't be EQ'd up, here's frequency response measurements of both headphones:
www.dropbox.com
www.dropbox.com
In terms of using them without EQ that could be a judgement call, DT700 Pro X is generally more "screwed up" in terms of frequency response so you might notice a few areas where certain frequencies are over represented or under represented, whereas the HD560s doesn't have quite same problem - but the DT700 Pro X will sound darker than the HD560s so that could be related to personal taste issue. Overall HD560s is the headphone with overall more potential for better sound quality I would say.