I'm still not sure what to order Z11 or Innosilicon  A9+ . The last is a bit costly and has a little less hashrate  (120Ksol/s vs 135 120Ksol/s) but, the way I see it,  A9+  is more  robust and relatively simple  to carry out prevention measures in regard of their long-term maintenance. Has anyone a difference   of opinion with me on that?