User blog comment:Ameno Miragu/Lessons from Spring E-4/@comment-99.65.177.189-20140510033149/@comment-24155103-20140510035847

Personally, I train all my ships at 3-2-A, nowhere else.

Some people like 4-3 for DD/CL grinding since there are two sub nodes there and it's relatively easy to get MVP on them if you have ASW equipment, making them the flagship boosts XP gain too.

You don't have a lot of options for your fleet setup though so make sure to check out the requirements for reaching the sub nodes.