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You are the customer. You should be able to dictate which controller you want.
You can put the two controllers together although I would recommend just replacing the existing one. Irrigation Caddy's website even speaks to this very thing. You simply run wires from the Irrigation Caddy outputs to the terminals on the existing controller.
New irrigation system - dual controllers - Irrigation Caddy
We just had our irrigation system done on our 1 acre property. I wanted to get an internet controller for more flexibility, etc. But the company that did the install, rightly so, wants to use their controller - RainBird. We have 9 zones, 1 of them being a garden, and a few others with sod. So I really wanted the ability to make more complex watering schedules/times. Can I wire up both controllers to the valves? The company that did the install have never done this but did not see a problem with it. I have a decent understanding of electronics and see no problem other than maybe feedback from the active controller into the non-active controller. Although, I would think since the controllers are controlling wires that are underground exposed to the elements, there might be some built in protection.
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