Learn basics of them all. I have worked for companies that prefer Lightwave, 3ds Max and Maya. Usually all modelers in a single company use the same software (as it easens up the license management, and content tool chain requirements). It's likely that you have to learn a new software when you get a job in the game development industry. Basics of 3d graphics are the same in all modelling softwares. It's the user interface that changes.