From: Winnipeg, MB
The smaller scenarios are fun, instructive and run very fast (the AI does not have to handle much land-based supply and fuel distribution).
Coral Sea is a good scenario for learning how to handle carrier battles.
Guadalcanal has carrier battles, surface combat battles, land combat, air battles and logistics.
The 1000 Mile War (Aleutians) scenario has surface combat, logistics, air battles and the possibility of land combat/amphibious landings.
Philippine Sea has a lot more ships and aircraft involved, a very tight timeline for arranging amphibious landings, lots of air combat and ASW, and the possibility of a massive carrier battle. Logistics are an essential part of the amphibious plans.
Downfall is a late war scenario setting up the invasion of Japan. Huge air battles including kamikazes, massive logistics and amphibious forces, lots of Allied ships and a few Japanese ships. You get to try a Strategic Bombing campaign too.
No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth