I'm using Lion Brand plastic dpn needles - I got them several years ago, and this is the first time they have worked well with a yarn. I guess it's because I'm using Lion Brand yarn!
When I tried using sharper pointed needles, the yarn would split too easily. The dull points on these needles let the fluffy yarn flow nicely.
I usually prefer metal needles, because I'm such a tight knitter. I cannot use wooden needles at ALL, because my hands and arms just ACHE after using them.
But, everyone is different. The best thing for you to do is to try using different needles and different yarns until you find the right combination. I use metal for cotton and other non-slippery yarns. I use plastic for slippery yarns. Some people like to use wooden needles for slippery yarns.