Tripod Head Difference Tripod 3-way Head Vs 4-way Head?

Tripod 3-way head vs 4-way head? - tripod head difference

Hello, I am a previous question that I have a choice between different LDP and tripod if you have other suggestions posted here are two
Velbon:
http://www.amazon.com/exec/obidos/tg/det ...

Slik:
http://www.amazon.com/exec/obidos/tg/det ...

I chose these two because the support of small angle and 8.5in and 6.5in. Manfrotto is good, but do not come with the head so that her head is a bit out of my budget, do not want to spend more.

My question is: What is the difference between the top 3-course meal and 4 heads way?

Slik Velbon or is it better?