Section X is best, if you farm all the creatures around the Hyperbiology quest you can usually pick u pto about 20-25 just while doing the quest.
I only go to Section X for bio mats (those dailies are a hassle). I just switch to the busiest instance and farm the corpses of all those creatures. I just stay close to the area where ppl are supposed to kill them for the dailies and farm. Lots of corpses laying around. I barely bother killing them myself. ( Just wait a for a few seconds in case the player who killed them is a gatherer as well. No need to ninja mats, lol )