Which Api to use?Beginner

Hello and nice to meet you.

After reading http://stackoverflow.com/questions/5493697/which-vmware-api-should-i-use i'm not quit sure

if i have to use assembly Vmware.Vim or VimService51.

Of course vmware.vim uses the other assemblies  but for example vimclient class is something very helpful as i can understand.

And it only exists in vmware.vim.Moreover vimclient is not documented.

I want to say that vmware.vim uses some proxy like classes which call some other core components.Those classes

make the life of a developer easier but i'm not sure if they are documented or even if it's the right way to go.

I'm a totally beginner and i would like to begin the right way.

Thank you in advance!

ps:Why aren't things simplier vmware?A single assembly for example?