Board Thread:Question and Answer/@comment-27980822-20160323194336/@comment-25435121-20160323212447

To answer your question more directly, it's not really either of those. The answer is C

The buff limit is a total of around 4 million for ATK and around 2.5-3 million for DEF. So if it take you 10 buffs to get there you still can, no matter what the % of that buff is.

The actual math looks something like this:

So as long as your buffs are greater than your debuffs, you can still hit the max cap.