Hi Victor,
The DRV8711 has automixed decay, which is an early version of AutoTune. Tuning is a little more complicated.
In addition to eliminating the cost and power of the two sense resistors, the DRV8886AT has a smaller package size when comparing the PWP package. The Toff time of the DRV8886AT is fixed versus the variable Toff of the DRV8880.
The DRV8711 has automixed decay, which is an early version of AutoTune. Tuning is a little more complicated.
In addition to eliminating the cost and power of the two sense resistors, the DRV8886AT has a smaller package size when comparing the PWP package. The Toff time of the DRV8886AT is fixed versus the variable Toff of the DRV8880.