I'd say TTK. I'm looking forward to rise of iron. But the house of wolves era was great. Ascending any and all gear, all the different activities that gave a chance at good rewards, that "legend of you" thing was awesome, all while having TTK on the horizon got me hyped up pretty good. Then TTK kind of burned me a little. The double rng for raid drops that certainly did not live up to previous raid gear levels, the infusion rate (fixed now but so frustrating until April) , the nerfs (specifically to hawkmoon for me). I'm much more cautious boarding the hype train this time.