  Coupling a 1D quasiperiodic interacting system to a Markovian bath, we study
the avalanche instability of the many body localized phase numerically, finding
that many body localization (MBL) is more stable in pseudorandom quasiperiodic
systems than the corresponding randomly disordered systems for a disorder
strength $W>8$, potentially up to arbitrarily large system sizes. We support
our conclusion by additionally developing real space RG arguments, and provide
a detailed comparison between quasiperiodic and random MBL from the avalanche
instability perspective, concluding that the two belong to different
universality classes.
