Most music producers and musicians use MAC computer products. Like the MAC Book Pro http://www.apple.com/macbook-pro/
I have a Video production company and sometimes edit/record music for my customers. I have always used PCs mostly because they are cheaper than the MAC products and so far have met my needs. It's really the software or music editing App that is important so they will need a good laptop, computer or tablet but also a good music editing software. There are some free editing software programs that can be downloaded from the internet.
I purchased and use SoundForge by Sony. It's a little tough to learn but is very robust for professional editing and music production.