Hmmm, I’d go for the Delerium my reasoning is:
I’m no expert on it, but Google leads me to believe it’s a much newer design than the BigHit? Whilst the BH has more travel, I suspect the Delerium is actually the more capable bike.
I rode there a month or so back on my 160mm/160mm Cove G-Spot, it was perfectly at home on the Blues and Reds, there are some big rocks there, but few actual rock gardens (I don’t know about the Black trails) maybe 2, most of the rocks form drops and they’re really nicely shaped. There’s lots of smooth berms and tighter bits that will be more fun on a slightly lighter, more agile bike.I’m also no riding god.
One of my friends took his fancy new 650b Intense DH bike, it was really very very fast on all the trails, but he’s a much better rider than I am and spent most of the day riding Black stuff I didn’t fancy the look of.