Pre-macrant note: There is no best, it just happens to work well for me and thus i obviously recommend it.
I've had the macbook pro + logic combo for ages, and imo it IS worth the money.
A lot is said about them being expensive, but there's a reason my mums dell laptop died after 1 year of highly infrequent and boring use, and my macbook pro has been turned on for literally 18 months straight, put under a lot of strain (over 300 complete battery cycles) and gaming under bootcamp, and has never given me any problems unless it was in windows at the time. I think its crashed maybe... 5 times in total when booted in OSX. It still runs like the day it was bought and clearly has years left in it. Its expensive because they don't cheap out on parts. Sure there are some horror stories but they're very rare from a "per user" point. I don't think I've ever heard anyone NOT complain about their PC at one point or another.
Yes a hand built pc is cheaper, it also has no warranty, and no guarantee it will all work.
Just to clarify I'm not an Apple fanboy, macbooks clearly have flaws, but imo the platform is far more stable and reliable from a music production point of view, and reliability is more important to me then free vst's/soundfonts. The guy says he's interested in logic and reason, which Another Soundscape will tell you work most harmoniously on his macbook pro . If you do go the apple route, but the lowest ram possible and upgrade it yourself, they do enjoy ripping you off on that front.