Disadvantages
Short spindle SLAs tend to require stiffer bushings at the body, as the braking and cornering forces are higher. Also they tend to have poorer kingpin geometry, due to the difficulty of packaging the upper ball joint and the brakes inside the wheel.
Long spindle SLAs tend to have better kingpin geometry, but the proximity of the spindle to the tire restricts fitting oversized tires, or snowchains. The location of the upper balljoint may have styling implications in the design of the sheetmetal above it.
SLAs require some care when setting up their Bump Steer characteristic, as it is easy to end up with excessive, or curved, bump steer curves.
Read more about this topic: Short Long Arms Suspension