Curtis did a succinct job summing up the differences. I own both and concur with his assessment.
Tell us a little about your setup, room size, restrictions, etc. so that we may better advise.
I'm using 340's LCR, 170s side surrounds and 200 classics as rear surrounds. I went with 200's for the rears mainly because I already owned them
and because they are mounted less than 6 inches from the rear wall. They all blend seamlessly. I've played them all in a 2 channel configuration and all held their own.
However you decide to go, I think you'll be very happy.
Doug