Personally, I think if you are starting at DL for three days, you should start at DCA for at least one. Pixar Pier lines (Incredicoaster, Midway Mania) are usually short in the morning. Webslingers and Guardians will be longer, but not as long as they are later in the day.
Lunar New Year starts in DCA on Jan 17. If you are interested in doing the food booths, it will be easier on the day(s) that you start at DCA. We usually get in line to purchase our items before the park hoppers arrive (maybe 10:45 am). You can order everything at one register and then bring your receipt to the different booths throughout the day. The lines are usually to order food, not to pick it up. You can order everything at one register. It doesn't need to be the register next to the booth where the food is being served. Most people get in line at the first register they see. Lines are shorter if you make you way farther into the park. Note that if you purchase a Sip and Savor pass (8 items), you get a MK discount.