For sure the Pacific was geographically much different than the Atlantic due due to the
necessity of island hopping. The combatants had to bring their airbases with them each
step of the way. To accomplish that the US built twenty-two U.S. Navy FLEET carriers
(CVs), nine small aircraft carriers (CVLs) and *many* CVE's during WWII. Germany
couldn't build one (half-baked is not "built." they launched a "hull")
As for the Atlantic it was the Royal Navy that had that theater covered with their own
carriers and they had no problem doing it. They killed the Bismark shortly after she tried
to break out and kept the rest of the small German fleet ships cowered and in hiding.
Because of those Royal navy carriers the Germans could not sanely foray outside the
Channel or the southern North Sea due to the lack of air cover. When they did....glub
glub.... down to Davy Jones locker.
So as far as naval things went the Germans could deploy little more than subs,
disguised raiders and the essentially insignificant FW200 patrols for the Battle of the
Atlantic. To combat that all the US needed for the Atlantic were the convoy escort
ships, with their sonar, and the small escort carriers. With the British CVs and fleet
ships covering the remnants of the German naval forces in the Atlantic and the North
Sea there was no need for the US to send their battle carriers to that theater*
After the Germans lost the Battle for the Atlantic by '43 and after D-Day the Royal Navy
spent much of the rest of the war with the Allies in the Pacific or free roaming off of
Norway attacking the German ships hidden away in the fiords.
*(Exceptions being the invasions of Africa,Normandy and southern France).
