Unless you have a very unusual situation, you should take a full load. Some may say that it is OK to take an easy load if you have a family or something, but if that is true, how will you be able to handle a super full load once in the OD program. That is how the admission person will look at it, "If they could not take a full load in undergrad, how will they be able to do it now?"
On the same note, I took a full load all through undergrad (17-19 cr.) up until my last semester. I had enough to graduate but I stuck around to have some fun and spend time with friends, I took 12 very easy credits that quarter. If that is what you are talking about, I think that is fine.
But I do agree with what was said earlier, it should not matter from a purely technical view.