BMW X3 53·Mercedes-Benz GLB 53on the MotiveGrid Score·Mercedes-Benz GLB about $7,095 less over 5 years
The verdict
The 2026 Mercedes-Benz GLB is the cheaper one to own — roughly $7,095 less over five years, mostly because it holds its value better. The BMW X3 counters with better mileage (33 vs 28 mpg combined) and more cargo room (31.5 vs 12.4 cu ft).
Go with the Mercedes-Benz GLB for the better long-term value; consider the BMW X3 if you prioritize better gas mileage and more cargo space.
Last updated July 2026 · National-average estimates
BMW X3 vs. Mercedes-Benz GLB
MotiveGrid scores, key specs, and five-year cost comparison: 2026 BMW X3 versus 2026 Mercedes-Benz GLB.
Metric
BMW X3
Mercedes-Benz GLB
MotiveGrid Score
53
53
Cost of Ownership
44
51
Powertrain
64
62
Driver Assistance
6
0
Livability
25
43
Safety
95
80
5-Year Cost to Own
$70,674
$63,579
Depreciation (5-yr)
$28,523
$24,353
Fuel / Energy (5-yr)
$10,263
$9,621
Insurance (5-yr)
$17,015
$16,010
Maintenance (5-yr)
$4,080
$4,080
Tires (5-yr)
$1,750
$1,750
Financing (5-yr)
$7,718
$6,590
Registration (5-yr)
$1,325
$1,175
Starting Price
$51,300
$43,800
Horsepower
255 hp
221 hp
MPG (combined)
33 mpg
28 mpg
Cargo volume
31.5 cu ft
12.4 cu ft
Seating
5
5
Towing capacity
4,001 lbs
—
Drivetrain
AWD
FWD
Gas
2026$51,300
MSRP
$51,300
Mo · 5yr
$1,178
$70,674 / 5 years
Best for families
Gas
2026$43,800
MSRP
$43,800
Mo · 5yr
$1,060
$63,579 / 5 years
Best for long-term savings
VS
01 · The MotiveGrid Score
Five measured pillars, weighted into one score.
Cost, Powertrain, Driver Assistance, Livability, and Safety — each scored against its class, then combined into a single MotiveGrid Score. Built by our engineering team and benchmarked against independent sources like NHTSA, IIHS, and CarEdge. How it’s calculated →
BMW X3
0
/ 100
Mercedes-Benz GLB
0
/ 100
CostFive-year all-in cost to own, benchmarked against the class median.
X3
44
GLB
51
Winner: GLB
$7,095 cheaper / 5 yrs
PowertrainEnergy efficiency paired with long-term ownership confidence.
X3
64
GLB
62
Winner: X3
+2 pts
Good fuel economy▲
Driver AssistHighway driving support, parking convenience, and hands-free automation.
X3
6
GLB
0
Winner: X3
+6 pts
LivabilityPassenger space, cargo room, and everyday maneuverability.
X3
25
GLB
43
Winner: GLB
+18 pts
SafetyCrash-test protection plus standard crash-avoidance features.
Mercedes-Benz GLB is the better pick for long-term ownership — about $7,095 cheaper over 5 years with stronger fundamentals on running cost.
BMW X3 still wins if your priority is best for families.
Daily commuter
BMW X3
Lowest energy cost per mile
Budget-focused
Mercedes-Benz GLB
Cheapest to own across 5 years
Family hauler
BMW X3
Much stronger safety with substantially more cargo room
Highway driver
BMW X3
Better adaptive cruise + lane keep
City driver
Mercedes-Benz GLB
Easiest to park and maneuver in tight spots
03
Cost of Ownership
Monthly running costs — national baseline.
Adjust for your situation
State
Miles/yr15,000
Loan rate7%
Down payment20%
BMW X3
Monthly · 5-Year avg
$1,178
$70,674 total / 5 years
Total · monthly$1,178/mo
Mercedes-Benz GLB
Monthly · 5-Year avg
$1,060
$63,579 total / 5 years
Total · monthly$1,060/mo
04
Frequently asked questions
Mercedes-Benz GLB comes out about $7,095 cheaper over 5 years on running costs (depreciation, fuel/energy, insurance, maintenance, financing). The gap shifts with your state, annual miles, and loan rate — use the "Adjust for your situation" panel above.
