Links Question

Hello,
I have a question about links.

For example, my website has domain : http://example.com/
And I have 3 pages/posts : Cars, Colors, Price

What is the best way linking those pages/posts?

#1

<a href="http://example.com/cars/">Cars</a>
<a href="http://example.com/colors/">Colors</a>
<a href="http://example.com/price/">Price</a>

#2

<a href="/cars/">Cars</a>
<a href="/colors/">Colors</a>
<a href="/price/">Price</a>

#1 or #2 ? and why?
Thanks.