This article is from the Frequently Asked Questions for Linux, the Free/Open Source UNIX-like operating system kernel that runs on many modern computer systems. Maintained by David C. Merrill with numerous contributions by others. (v1.0).
A: The "best" of anything depends on your particular needs. Discussions like these frequently occur on Usenet. Most often they're flame bait. Answering is generally a waste of time. Free software licensing is unrestrictive enough, that, with a little experience, you can perform your own testing on your own hosts.
A better way to phrase a specific inquiry might be: "Where can I find...."