I'm editor and designer i need a laptop for editing and rendering?

If you are talking about editing and rendering documents such as magazine pages, etc., any computer will work. The memory and processor intensive work such as audio, video, 3D rendering, etc. Are traditionally Mac dominated areas among professionals. The GUI interface tied to the software designed to take advantage of Mac capabilities make it superior in all respects in those fields. Unfortunately, many can only afford a single computer and thus go with the more portable, IE: the laptop. No laptop can compete with a fully upgraded desktop computer for processing power and speed. The first thing you will find among professionals is that they have a laptop (I use a MacBook Pro) for the minor work involving being away from the desk and a desktop (I have a 12 core dual 3.46 GHZ CPU MacPro tower) for the real work. Editing and 2 dimensional rendering can be done on a portable, but 3 dimensional and anything requiring large file manipulation require either more processing power than a laptop can provide, or long waits as the numbers are crunched.