Are you looking for just On/Off via Almond+. I have felt that with some purpose built devices, it is better to have smarts on their own. I have a Rachio and that does a good job of working with the weather and soil and run offs and seasonal adjustments to ensure that my lawn is kept watered while minimizing wastage. I don't think you can get that level of smarts with Almond+ or generally any HA platform.
Similarly for Nest, you lose a lot of the inbuilt "smartness" by using another HA controller.