Greetings,
My friends and I have a heated debate going about which to use. I love old warfare because of its ability to neutralize diplomacy and signal jams. You also could concievably move farther using old warfare. For example: a ship has 2 move goes to staging point 2 sectors away, old warfare is used to remove the command counter, and then you hit a sector 2 hex's away with they rest of your fleet. Also that means when you move the fleet to the hex you can also build in that hex. This is very important especially because this is generally the best time to build up your fighter meat shield.
Warfare II gives +1 to all combat rolls for the high alert hex which is pretty cool except when someone pins you with diplomacy/signal jam. I hope you have a sabotage or agent handy. Also an unexpected action helps(hope it doesn't get sabotaged).
My point is that Warfare/Diplomacy have been counter balances to each other in the past and with Warfare II that's just not the case.
Very interested in any input you guys/gals have on the subject!