[TheWamp]

I vote for Eldar

If they deploy the falcon and maybe a waveserpent forward to hold the infiltrators back, they can retreat those 2 on the first turn, giving the entire army 3 solid turns to shoot at the advancing death guard

5 starcannons
15 shots
7.5 hits
5 wounds
5 kills

1 pulse laser
2 shots
1 hit
5/6 wounds
5/6 kills

3 twin-linked brightlances
3 shots
9/4 hits
15/8 wounds
15/8 kills

2 shurikannons
6 shots
3 hits
2 wounds
2/3 kills

So a total of 7.5ish kills per turn, for 3 turns. That means that the terminators and the havocs all die before they get a chance to do anything. More importantly, even though only 3 turns of shooting are gauranteed, the eldar can probably simply stay out of the range of the death guard and continue to fire on the DG. The skimmers in this army can deal quite a punishment, and if the warwalkers can find a clear line of retreat, they can move back 6"/turn, firing the whole way.

Overall, as long as the eldar DON"T just fly forward and engage the enemy in cc, they can win. The slowness of the Death Guard and the weaponry on the skimmers assures this.

And if they need to take out 1 or 2 last squads, deploying 3 aspect squads all at once should easily do the job, especially considering the scorpion's claws and the executioner.