The answer to the question "What is the best laptop for MacOS X" is easy. It's this 15-inch MacBook Pro with Retina. It's light-weight, powerful and has a fantastic screen. The same holds true for the Windows environment, unless you're a hardcore gamer. In that case you probably want a more powerful graphics card.
The price of the new MacBook Pro with Retina is rather high though. The entry-level version with a 2.3 GHz quad-core Intel Core i7, 256 GB SSD and 8 GB RAM costs £1,799. The 2.6 GHz version with 512 GB SSD costs £2,299. If that's still under your budget, you have the option of 16 GB RAM, a 768 GB SSD, and a faster Core i7 processor as well.
Even with the high price in mind, this is still a very unique and innovate laptop that combines high performance with low weight and good battery life, not to mention the beautiful display. The absence of upgrading options and the daunting price tag are not enough to prevent us from giving the MacBook Pro with Retina a Gold Award.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips