From factory, Rubicon has:
- 4:1 LO range (crawl ratio of 77:1 with automatic and 84:1 with manual)
- “Dana 44” axles that are much stronger and feature a different ring and pinion (210 mm/8.27 inches front and 220 mm/8.66 inches rear on Rubicon)...based on Dana’s new Advantek design
- Front and rear lockers
- Front axle disconnect that is improved upon
- Standard rock sliders
- 33-inch-tall LT285/70R17 BFGoodrich All-Terrain KO tires
- Ample clearances & angles (impressive 10.9-inch running ground clearance, an approach angle of 44 degrees, breakover angle of 27.8 degrees, and a departure angle of 37 degrees)
- 30 inches of water fording (with standard breather tubes on both axles)
- Available Diesel engine next year with 260 hp and 442 lb-ft of torque...add that to 4:1 LO range...yikes!
So, yeah, i doubt that any stock (or even most modified) Toyota vehicles can follow a Rubicon on the trail. You have to really trick out your 4runner with $$$ aftermarket parts to match what the Rubicon has off-road in terms of capability.
But, yeah, the argument against Jeep is reliability and on-road performance. But at least, Jeep claims that on-road performance is improving. So, will see.