I never start at a park that has EE if I don't have EE because there will already be lines. We always do Fantasyland first at DL, so EE makes a big difference there since most of those rides don't have G+/LL. But it really just depends how important starting your last day at DL is. If you're not doing Fantasyland, it might not be bad to start at DL in an area that doesn't have EE where you'll be on more even footing, such as Adventureland and Frontierland (Indy, BTMRR).
Which attractions in DL will be most important to you that day? If those attractions have G+/LL, keep in mind that even though you start in DCA, you can still get DL G+/LLs from DCA as long as the return time is after 11, so that might be helpful.