When I read your question I thought you were trying to decide between taking another D3 team or moving up to D2 in a world you were already in, because as hughesjr said, you have to start out at D3 in any world you haven't yet coached in.
As a general rule I like D2 better as well. I do have a couple of D3 teams, but the lack of cash compared with D2 is significant enough that it can matter.