How my website is dropping?

[ffbrunoff]

Hello there guys!

My website www.ntcbrasil.com.br is dropping comparing to my competitors.

My main keyword is: geotextil 
And my main competitor is: www.mantasbrasil.com.br

We have better and original content. We have better structure website with better SEO practice (so a i thought).

I'm not able to find out what's making the difference between my website dropping and my competitors raking first.

This is in google Brazil www.google.com.br

If anyone could give me any direction i would appreciate.

Thanks a lot!!

Bruno Nunes