I'm going to go with a couple of local areas.If we are talking trails, features and variety I will say The Frederick Watershed. Not because I live here...because I have been here for a year and a half and have still only touched about 1/2 of the trails. The amount of tech, flow, features, trail maintenance that is put into this place is unreal. The number of out of state license plates tells the story. I want to say it's most similar to a ringwood if you threw in a touch of chimney rock and waywayanda. XC, Enduro to downright steep ass DH bike only trails.
If we are talking back country with a view...it's tough to beat George Washington State Forest(Shenandoah/Harrisonburg area). Where else can you climb Foran hour and a half and descend for 40 minutes?
If you are there for the view Mt Falcon in Morrison , Co is nice with decent trails(not anything special).
Bucket list...any trail system near where Nino comes from in Switzerland...the views are incredible.
Honorable mentions-
Ringwood- I think this is still one of the best places around to learn bike handling skills.
Chimney Rock- How can you ever say no to this place. It's small but filled with a ton of cool features.