Mercedes-Benz has a lot of SUVs to choose from, the GLB is one of the smallest. Sharing an architecture with the sleeker GLA, the GLB 250 sports an upright design and the option of squeezing a third row into it. Available with front or 4MATIC all-wheel drive, it covers a lot of bases with loads of passenger and cargo room. But it is a Mercedes and buyers will be paying for that large three-pointed star on the grill. Tom Voelk checks out a modestly optioned GLB 250 4MATIC with the AMG Line trim package.