Going for the most low pop server would be the best option of course. Any streamers server is going to be swarming with fanboys that'll cater to their beck and call. Getting Scarab Lord will be a bitch too since all the fanboys will be paving the way for their streamer of choice to easily get to the end of the questline.
Personally I'm going to pick a server with a cool lore-important name that's also low pop.