I want to know if the bsd distros are for the desktop usage at all
If yes; What is the Best bsd distro for desktop usage some thing like ubuntu linux which is easy to use and good GUI management instead of command line system management
Like Code Gray said : "Best distro" is an extremely subjective question.
However, FreeBSD has certainly the largest community in terms of number of users and ports. I think that you could try it.
In addition, there is a system based on FreeBSD named PCBSD :
PC-BSD is a free operating system with ease of use in mind. Like any modern system, you can listen to your favorite music, watch your movies, work with office documents and install your favorite applications with a setup wizard at a click.
My answer is very subjective, but I think it may help you.