@Minnewegian career wise it's more important to know software than the OS as you'll likely be remoting into or directly using a work computer especially handling legal docs. Get what works best for you personally, staying in the Apple ecosystem is the least friction, but you could probably save a lot switching to something else. You could even skip the laptop and use your phone with a nextdock for out and about and a USB dock + monitors for home if you just need to do office level work.