I have the Hydra and really like it. You can manually calibrate the Hydra. So if you have a reliable hygro then you jkust adjust the hydra to match.
Let me know if you have any questions.
Also make sure you have a back up passive humidification device in place (humi beads is what I use) Because when you lose power the hydra ( and I'm assuming the Oasis) will not turn back on by themselves. Art, I think you need to look into some beads as well for the same reason.