In the Navy you sink a ship from far away. It's more abstract; you don't see the enemy up close.
In the Army you fight battles face to face with the enemy, and it must be correspondingly more horrible.
So I would guess that Navy people (like my grandpa) had a generally more positive memory of the war than Army people.
I can recommend Nicholas Monsarrat's "Three Corvettes" on his wartime naval experiences - I happened to buy this without knowing much about the book in Heathrow before a flight over the North Atlantic to the US. One of the relatively small number of books that has moved me to tears.
http://en.wikipedia.org/wiki/Nicholas_Monsarrat
He also wrote the novel "The Cruel Sea" which was made into one of the best naval war movies of WW2.