The net difference in speed between the 4runner and LC is not that dramatic. They both are low to mid 7 second vehicles, and roughly low 15 seconds 1/4 times. Neither is going to take a Honda Accord for example.
Though the Land Cruiser does have the straightline edge, low end grunt for day to day driving, and is smoother by nature of it being a V8. When loaded, the LC will again have more power and reserve.
Honestly, I can't knock the 4Runner. If that's the money you want to spend, it's arguably the best in it's class in my mind. Same for the GX.
If you have money to burn, need space, or really admire the heavy duty nature of the LC, that's where it's at.
Though I will say my 2005 VVTi V8 4Runner was by far the fastest of the bunch back in they day they offered the V8 motor, which only the GX has now.
On another note, I think the GX barn door get a bad rap. It's super easy to use and glides open/closed. There's no supporting or pulling effort to open or close as there is on a hatch or clamshell, and only one door/latch to bother with. I've used all 3 door configs between the 4runner/GX/LX. They all have their pros for various reasons.
Featured Vehicle: Adventure Driven’s Lexus GX 470
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