The Landcruiser is the real deal, built like a brick $hithouse and designed purely for going anywhere anytime. Overseas they have like 20 different models of LC's and that's what they use. You won't see the taliban or armies in Africa driving Sequoias or RAV4's. They drive solid axle Toyota Hilux's and Land Cruisers because they are real.
The Sequoia, I'm sure is reasonably competent off-road, but it's really targeted at the Tahoe buying soccer moms and people who might tow a boat occaisonally.
When a vehicle comes with 3 locking differentials, you know it's serious.
I'd take a used FJ80 over a new Sequoia any day of the week.