slartabartfast
A Mac is just a particular instantiation of an Intel CPU machine with deliberately limited compatibility with software and hardware in order to create a proprietary environment where everything that is available is tested and certified to avoid incompatibility and the price of everything is artificially inflated. Bootcamp is an Apple product that provides the drivers etc. that make the machine compatible with Windows, so you can run the Windows OS and compatible programs on the machine. You need to have a licensed copy of Windows to install it under BootCamp, which then allows you to run Windows on a Mac. At that point you are running Windows, not Mac OS, on the machine, and it has become an overpriced Windows machine.
Brilliant! I rarely get to appreciate writing on this level: compact, to the point, accurate, and clever. As a professional writer, I bow in deference.

(And this is from someone who has an Apple desktop, MacBook Pro, iPad, and iPhone.)
As to the OP, I'd recommend GarageBand because you will have no performance issues running it on a Mac. Admittedly SONAR is much cooler, but if you really get bitten by the recording bug and have an immediate need to stay with the Mac, Logic Pro X is $199.