Arrma Big Rock 3S BLX vs Losi LMT Grave DiggerWhich Should You Buy?

Calling both of these monster trucks is technically accurate but practically misleading. The Arrma Big Rock 3S BLX is a modern basher with independent suspension designed for speed and all-terrain fun. The Losi LMT Grave Digger is a solid-axle monster truck designed to replicate the real Grave Digger's wheelies, backflips, and stunt capabilities. These trucks attract fundamentally different buyers with completely different goals.

Speed goes overwhelmingly to the Big Rock at 50 mph versus the LMT's 40 mph. But raw speed was never the LMT's goal. The Grave Digger is built around its solid axle design, which enables monster jam-style stunts that the Big Rock physically cannot replicate. The LMT does wheelies on demand, pulls off backflips with surprising consistency, and looks spectacular doing it. The Big Rock is fast in a straight line and handles well, but it's not a stunt truck. Asking the Big Rock to do a standing wheelie is like asking a sedan to do a burnout, theoretically possible but not what it was built for.

Size favors the LMT significantly. It's a 1/8 scale truck measuring 22.84 inches long and 17.52 inches wide with massive ground clearance at 3.54 inches. The Big Rock is 1/10 scale at 20.47 inches long and 14.57 inches wide with 2.05 inches of clearance. The LMT looks imposing sitting next to the Big Rock. It weighs considerably more too, at 11.13 lbs versus 6.77 lbs, which is a natural consequence of its bigger chassis and solid axle components. That weight, combined with the massive tires and high center of gravity, is actually what makes the LMT so good at stunts. The mass carries momentum through rotations.

One thing that might be a dealbreaker: the LMT Grave Digger is not waterproof. The Big Rock is. If you drive in wet conditions, through puddles, or in rain, the Big Rock won't care. The LMT needs dry weather or waterproofing modifications. For a truck at this price, the lack of waterproofing is a legitimate drawback that limits when and where you can drive it. Aftermarket waterproofing solutions exist, but they add cost and complexity.

Battery-wise, the LMT runs 5000mAh 3S packs while the Big Rock specs 3200mAh 3S. Both are 3S systems, so battery costs are equivalent per cell. The LMT's larger battery capacity gives it better runtime, though its heavier weight and solid axle drivetrain consume more power per minute. In practice, runtime is comparable between the two.

Value depends entirely on what you want from an RC truck. The Big Rock at its price point is considerably cheaper and faster. It's the better general-purpose basher by pretty much any measure. The LMT at its mid-range price is a specialty truck that gives you an experience no conventional basher can match. Watching a 1/8 scale Grave Digger pull standing backflips never gets old. The licensed Grave Digger body is beautifully detailed and turns heads at any bash spot. But if you just want to rip around a field at speed, the Big Rock is the obvious choice. Parts availability is good for both through their respective parent companies, though the LMT's licensed body is harder to replace and more expensive when damaged than the Big Rock's generic shell.