Don't think theres a right or wrong way to answer the question, much depends on where you ride and what you ride track wise.
To me flickable is lighter, easier to pick the bike up and skip over stuff. My 2011 KM is built light and SS at the moment, haven't weighed it but reckon under 25lbs. Can be exciting on fast tracks as it's easy to pick up and throw about, it's exciting because you can feel the frame give and twang back when pushing hard.
Of the Krampus and Instigator, i reckon the Krampus would be the more fun all rounder.
The Instigator would be up for serious Downhill racing abuse, it might (haven't ridden one) feel a bit dead on easy tracks as it's not being pushed to it's limits.
The Krampus is a lighter frame, be a bit more zingy in it's ride and be more exciting on less demanding tracks.
Weight wise i don't think theres much between the 2, wheel and tyre weight.
I like heavy wheels for racing as they just carry momentum and steamroller rocks. I tried a super light DH Hardtail, and like others found it hard to control when really pushing it, a bit of flex in the fork, bit of flex in the wheels and frame and all of a sudden you have a bike that when pushed hard won't hold a line over rough stuff, and when you jump things the combined dynamic flex and recoil can ping you off the track and into a tree/hedge/rock filled ditch

(i know this)
For abuse and racing go Instigator.
For light abuse and trail go Krampus.
I have raced a few DH races on the rigid KM, get the rear wheel fully forward, pick my lines, try not to smash through things, work the light flickable nature of the KM. I set up using DH bars and short stem, flat pedals, and the biggest tyres i could fit (had to hand) and comments from others...... we kinda agreed it was like a big bmx

You could experiment with the Ogre, wider bars, shorter stem, fatter tyres, lighter or heavier wheels, mix things up a bit.