I have a camo 2002 Vanguard 6x6 that I purchased a decade ago from a pharmacist in Anchorage - $3995 on CL, and another $900 to ship it here.
Our winter moose season is often lacking enough snow for proper snowmachine travel; for such years, I bought it for that, though I have used it for other things too. It does not get used every year, but when I need it I am mighty glad I have it. Original plans were to put tracks on it, but I use it infrequently enough that I haven't sunk the money into any yet.
I have no experience with an 8x8, so I can't comment on how they might be better, though it makes sense. I will add that I once hauled out 2 paddlehorn moose, my hunting buddy and me, and our gear, in one load, so I have no issues with my 6x6.
To this day, I have no idea why he sold it so cheap; it has been completely trouble free. The only thing I have changed through the years is new tires, and I added a winch to the front. It has hauled more than a few moose for me and my friends.
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