IMO the valley trails are better than the park.
But, 6 days to cram it all in is nigh on impossible. The valley stuff can be some long, long grinds up fire roads to reach the trail head. If I was doing 6 days i’d probably want maximum bang for my buck, that wouldn’t include riding up fire roads for hours at a time!
I think i’d try and take as much of the park in as possible, then ride some of the valley stuff accessable from the park (Khybers/RDS/Trespasser). Take a bead on the black park tech for your level of riding, a lot of it is pretty full on.
I’d definitely still take the Reverb though.