Board Thread:Questions and Answers/@comment-24731329-20151214233123/@comment-26848183-20151215005315

When I discussed this in the past, the three maps that stuck out the most were 1-1, 1-5, and 5-4.

1-1: Most popular choice. It's cheap, it doesn't cost any buckets, and allows you to sparkle expedition ships at the same time. Rather than using one sub to clear 1-1, I recommend using a level 20 or higher destroyer and a fodder destroyer to clear the map, then scrap the fodder without refueling it. That way, you'll get your backup/expedition destroyers leveled, and they'll be sparkled for expeditions for the week. You'll get back your resources from the great successes.

5-4: Popular to rankers who wants to add points, but doesn't need to sparkle any more ships. Has guaranteed boss routing.

1-5: This is more like a special mention. It's the earliest map to have guaranteed boss routing. It's an alternative to 5-4.

Are clearing that weekly quest for the improvement materials? If so, I made a flowchart for myself on how to clear weeklies efficiently. It combines multiple quest objectives together, so it might help you if that is your goal.