Replying to AR5's vs. Chronics?

I am considering buying either 04-05 Line Chronic 177's and 04-05 Armada AR5 180's, and am wondering if anyone has any suggestions on which ski I should get. I ski about 50-50 park and all mtn, and want something that is durable for rails and boxes, yet stiffer so I can still carve on the groomers, plus something that's decent in pow. Any suggestions on which ski is better? Oh btw, im 5'11" and 170 lbs, and have been skiing for 13 years.