I was recently told I had to use a very specific tool to perform a particular task. This lead to a discussion where I listened to the reasons they had in mind and immediately agreed to use the tool. Interestingly, the conversation carried on for quite a while where they attempted to convince me that the tool was the best choice for the circumstances. They never convinced me, but it did raise an interesting question in my mind.
How often, when we've already gotten the answer we wanted, do we continue beating a dead horse just to prove that we are "right"?
Doing things like that in business makes it hard to get repeat business and even harder to get referral business. (Who wants to tell their friends to go visit so-and-so because they'll make sure you get properly abused along with their stellar service?!)
The real question is whether you need to be right or just get the job done.
(Last time I checked being right doesn't pay bills.)