I have owned and gigged the CN212, and before that the DB212.
Both great cabs. Sound great, look great, and are just top-notch in every way. The CN wins hands down in terms of weight, portability, etc... Especially compared to the DB212 which had kind of lame casters. Even if you go 2x112 on the Aggie cabs, think about the fact that one of the DB112s is going to weigh about the same as the CN212!!
I know port location makes no difference in terms of sound, but I also really prefer the front ported CN. When things are tight on a stage, a half a foot closer to the wall can be big. Just one less thing to worry about for me.
The two cabs are in the same family sound wise, but do have differences. To me, the big difference is kind of where the mids are centered. The CN is kind of more focused on the low-mid-mids,, and the DB cab has a little more in the upper-mid-mids. The CN sounds a little more beefy, but the DB kind of cuts more.
CN is a very smooth cab. The top end is very sweet and just rolls off so nice. The DB cab has a little more bight to it. It will tend to growl more than the CN and it's round sound. The attack on the CN seem softer to me, where the DB seemed to have a little more edge to the attack. Like playing with fingers vs a pick - kind of.
Both are very nice and you can't go wrong either way. I love the DB cab, but did not like the schlep... so I decided to trade up for a CN. On my first gig with the CN I thought "oh no, I made a huge mistake", but after a while, the cab broke in, and I love it now.
I've owned a few cabs along the way, and for an all purpose gigging cab, the CN is the winner in my book.