The type of intelligent watering you mention is being developed in the OSPi version. I don’t see this being worked on for the Arduino variant but I don’t follow that as closely.
This is very good news and reason enough to choose that platform. Where I live, the Pi’s higher power draw over 6months/year operation only needs to be compensated by 2m3 of water saving to break even. Intelligent watering should easily cover that.
Thanks again for your help.