Building Levels and it's contents question

Hey Guys

Hope I explain this clearly, but I just wanted to ask a quick question. When I am building out my level, let’s say I have a number of buildings to place in that level (which are modular), is it best to create the buildings in the level its self with the modular pieces, or can I build each building in it’s own separate blueprint actor (one blueprint for each building) and just drag that building blueprint into the level?

Is there any advantage or disadvantage to doing it either way besides the clutter in the world outliner?