As the IT guy, your job is to optimize the productivity of the people who are getting the film made, right? Therefore you need to do a survey of everybody and find out what software they are all familiar with, and then you need to use that. If you need to train them on new software, then that is not only a waste of your time, but much more importantly, it's a waste of their time.
Don't use this as an opportunity to push your agenda. Just get them working immediately using whatever software they are currently comfortable with.