You can do either but I would say that you will.have to work more on a HT in terms of paying attention cause it is fast and tech
Dedinitly full suspension would be my preference. To get full speed on the downhills without losing control full suspension cant be beat. The added weight is not much of a limiting factor on the uphill.
A full suspension bike will offer you the smoothest ride, but I've seen guys throw down on a hardtail. It's personal preference, really, but there's a reason why it's called ROCKY knob.
Personally I'm a fan of using a full suspension bike at Rocky nob because of the varied terrain, but I've seen plenty of guys have a great time on a hard tail.
Full suspension. Hardtail is hazardous and limiting
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