Do i use wax or gel to create this hair style ?

Im a guy with medium length hair and was wondering how do i maintain my hair in a certain style. Which is better, wax or gel and what are the differences ? Here is a pic of what i want my hair to look like - http://www.google.co.uk/imgres?imgurl=http://i.ytimg.com/vi/apGlAL-smCQ/0.jpg&imgrefurl=http://wn.com/Enrique_Iglesias_Interview_With_George_Lopez_Tonight_2010&usg=__Uh204UikG4gjS9zoQ9AERGJE-SY=&h=360&w=480&sz=10&hl=en&start=0&zoom=1&tbnid=WVjVSpoKiIqfkM:&tbnh=119&tbnw=157&ei=yUtoTff1B4iAhQf1i9GzDQ&prev=/images%3Fq%3Denrique%2Biglesias%2Bgeorge%2Blopez%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1345%26bih%3D521%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=94&oei=yUtoTff1B4iAhQf1i9GzDQ&page=1&ndsp=22&ved=1t:429,r:5,s:0&tx=107&ty=46