一致 highlights that "we have the SAME viewpoint" 都 highlights that "ALL of us have the same viewpoint" 我们一致认为你是对的。 this phrase highlights "what we think is U R RIGHT" 我们都认为你是对的。 this phrase highlights "ALL of us think u r right, there is not any exception" for most cases, these two words can replace each other. however, for informal conversation, we use 都

In my opinion, you can use both in this sentence. But the focal point is a little bit different. "一致" emphasis on the poinion or suggestion are the same. And "都" emphasis on all the people. Also, I think the tone to use "都" is softer than use "一致". How to use it depends on the context . Hope this can help!

一致， in my view, they are almost the same. However, 一致 emphasises the "same" meaning.

sometimes "都“ means much more colloquial, in daily spoken language; "一致” seems much more formal

My dictionary says it can mean 'unanimously.'