It's really the software and what you need this system to do that should determine what computer you want to buy, not the case that it sets in.
I own both Mac and PC systems. I do software training and demonstrations, and have to be able to show either platform (or occasionally, both) to address specific audiences. MacBooks are well-designed, well-engineered systems, but rather pricy and depending on the application, lacking in relevant specifications to powerful, less expensive PC laptops. And you're almost always going to be spending more for upgrades to extend the capabilities of a MacBook than you will for PC-based laptops.
OTOH, a lot of PC laptops aren't nearly as well built as MacBooks, and are sturdy enough for some uses. But not for others. And if something goes wrong with your system while it's under warranty, it generally takes a lot more effort to get it fixed with many PC-based brands than it does with Apple laptops -- especially if you live in close proximity to an Apple Store, which can often handle repairs/exchanges onsite.
I like both my 15" MacBook Pro and my 14" Dell laptops. For what I do I have my preferences, but they'd likely be irrelevant to what you may want to do with your new laptop. Rather than start by choosing a box, you should probably start with what software you need to put into it and what you want to get out of it. When you can honestly and accurately answer those questions, it'll be easier to make a call on what laptop you should buy.