Evendin is much better built and will get you from 30 to 40 easily.
Besides, if you ever get the path of the fellowship pack from any cash offer or even with points, it will unlock you trollshaws for your other characters and you won't be wasting TPs.
After you are finished with Evendin, I would suggest Angmar. Many solo and group quests in there. Excellent instances to run with friends and to help you with your legendary class quests. More than enough to get you to level 50.
Of course, if you get to buy the Path of the Fellowship quest pack, none of these two are included, so you won't be wasting TPs on anything.
(As a side note, Mithril Edition and RoI Legendary pack both get you the Path of the Fellowship QPs and are both at a discount these days).