Currently the Intel i5 processor is the most famous processor being used in PCs and notebooks. You should look for a laptop with this processor, which will speed up everything you do.
The most powerful processor is indeed made by Intel. AMD has done a great job of catching up though.
Intel Core Processor family
Since Windows (at least the kind most people use) only runs on x86 and x86-64 processor, the "best" processor for both would be the most powerful processor from Intel or AMD.
"The most popular laptop notebook is a Dell Inspiron 15R that was release this year. It has a Intel Core i3-2310M processor and a 15.6"" screen. The second most popular is the Dell XPS 15."
Intel zion
Intel® Xeon® processor 5500 series. As of December 2008.
Intel is currently preparing a six core processor for release.Four processor are the most you can get now.
It depends on what you want to do. For the most part Intel is overall a better processor. Currently Intel Core i7-5960X is a best and fastest processor out there for the money.
I7
Intel is the world's largest semiconductor company. Intel is famous for their processors for e.g. notebooks, desktops and servers.
Intel and AMD.
Macintosh's processor (produce by Intel) are the most common use RISC technology.