330s have 2 more inches of pitch in the first half or coach, as well as power ports.

I'd take the NW 330. However, if flying on short notice and buying B or Y fares, I'd fly whatever had a mileage UG available.

I love AVOD. CO has teh private screens, but a 2:45 hour loop. That's way too long. And, if you make it up front, you can't pause when the FA comes around.

Some of COs fleet is UGed to AVOD IIRC, but you never know what you are going to get.

And, if you only have Delta miles, I suggest you find the Coupon Connection forum, where you can trade for CO or NW miles, which will get you UGed on their products.

CO's program costs the least miles to UG.