Originally Posted by
Tarazet
Either Worgen or Night Elf is fine. The Nelf's dodge bonus is technically more valuable (because it takes more stats to replace 2% Dodge on your gear), but Worgens get a bonus to Crit which is our best stat. The world's first 10HC Lei Shen kill included a Worgen Guardian Druid. There's nothing wrong with either choice.
If you are in Feral spec and running dungeons in bear form, you will do less damage and be harder to heal than if you were in Guardian spec, so it's not advisable. If you queue with a tank and healer, you will get instant queues all the way to 90, so pick what you want - either quest together and kill things as 2 DPS, or dungeon together and chain pull your way to success.