Which of the two tests are better? Or are recommended? Amniocentesis or cvs (chorionic villus sampling)? No past history of any health problems.

It depends. CVS is generally thought to have a slightly higher miscarriage rate than amniocentesis, but this may not be the case everywhere. For mor e information check this link: http://www.babycenter.com/0_chorionic-villus-sampling-cvs_328.bc?page=4#articlesection8.