This is a draw... I think
There seems to be not a lot information about rations and the details are sketchy. On some sites, American rations (particularly K-rations) were greatly praised to the high heavens, but there were also some criticism about insufficient calories and malnutrition. Troops have been known to complain about the monotonous nature of their rations and toss it.
I couldn't find anything about British rations but they look more same old than the Americans
I let you be the judge: [link]
Spam seems to be everywhere o__o
Round 1: [link]
Round 2: [link]
Hetalia (c) by Himaruya Hidekaz, Gentosha Comics.