The 8000 is my primary ski in a 178 (6'1" 210 lbs). I also have an Inspired which is the predecessor to the 8800 (same dimensions) and Mythic Rider (which has more shape). If you are interested in a 178 Intuitiv Big, I am about to unload a pair cheap once my freerides come off, so let me know. Cheap like $100-200 with minor base ware, no core shots just scrapes.
These are two completely different skis. Just check out the difference in shape profiles and turn radius. There are fatter skis than the 8800 that are easier to turn and swing around (I just bought one to replace it, in fact). 8800 rules on big open stuff, love them on Mount Washington. Not good in the tight stuff (from my perspective). Just too many compromises. Fun ski to let rip in natural snow, not a one ski quiver for the east.
I am surprised you are trying to decide between these two skis. What is your criteria, what are you looking for? A mid-fat or a powder ski? A quiver ski or a one ski quiver? Snappy quick light weight forgiving turns or a little more meat that prefers a little running room and more open spaces. Lots of possibilities here, but you are currently looking at skis in two different categories that are not related in terms of performance even if they are related in terms of construction and design.