Web traffic analytic service ComScore has released data on real estate sites Zillow and Trulia’s March 2011 performances.

The two sites have been in stiff competition for leading real estate information provider, but on a year-to-year basis, it would appear Trulia is stomping its competition. In terms of minutes spent on each site, Trulia grew 79 percent from last year compared to Zillow’s 22 percent growth.

“We have invested heavily in enhancing our user experience and offering the best data available to consumers,” said Ken, head of communications at Trulia in a blog post today. “This investment continues to pay off as our audience grows and becomes more engaged every month.”

Trulia also ‘Trumped’ Zillow on improvements of visits with a 77 percent increase compared to Zillow’s 65 percent increase, and in page views with a 66 percent increase compared to Zillow’s 28 percent increase.

To stay competitive, Zillow has been highly aggressive as well, combining forces with Yahoo back in February and releasing a BlackBerry app last month.

Yesterday, Zillow announced it has obtained online listing platform Postlet.