Final answer:
The other rower with whom Joe was more comfortable was the oiler or the cook.
Step-by-step explanation:
The other rower with whom Joe was more comfortable was the oiler or the cook. Throughout the text, the oiler and the correspondent take turns rowing the boat, to the point where they are exhausted and take breaks to rest. They exchange places carefully, and the oiler, cuddling down to the sea-water at the cook's side, seemed to go to sleep instantly. This suggests a level of trust and comfort between Joe and the oiler/cook.