Hmm, six of one and half a dozen of the other I'd say.
Depends on how you're using your engine too, what kind of opening book its using, its personalities etc etc.
Obviously playing as strong as an opponent as you can has its benefits, but computers make a lot of moves you won't find humans playing (even at the top level) so it can leave you wondering why you didn't spot X move in a certain position (when almost no-one would) which can affect you negatively I think, like when you analyse with an engine and start beating yourself up for not finding the advised "computer moves".
Any body with some ideas on this question?
I am learning to improve my game (god knows I need it) so is playing against computer as good as human?
As I see it, computers don't seem to make the same kind of moves and errors as humans do, and they can calculate dozens (or more...) of moves ahead.
Brosche