Most civilian procedures seem to recommend landing along the swell, assuming you're landing at sea. Below from the A380:
The following guidelines can be used to evaluate wind speed:
A few white crests: 8 kt-17 kt
Many white crests: 17 kt-26 kt
Streaks of foam along water: 23 kt-35 kt
Spray from waves: 35 kt-43 kt.
Sea state:
This is best determined from a height of 500 ft to 1 000 ft. At lower height, the direction of the swell may be less obvious than the direction of the waves, even though the waves are much smaller.
When there is no swell, align into the wind.
In the presence of swell, and provided that drift does not exceed 10 °, ditch parallel to the swell and as nearly into the wind as possible. If drift exceeds 10 °, ditch into wind. The presence of drift on touchdown is not dangerous, but every effort should be made to minimize roll.
Touchdown with approximately 8 ° of pitch and minimum vertical speed.