Barchart Stock Screener, found under Stocks header > Stock Screener, gives users the ability to screen for one MA over another.
To screen one Moving Average over another, click on Stock Screener. In the Stock Screener, click on Technical Analysis > click on Moving Average > click on the first MA range that you want > click on Add. Once the first MA is added, click on "greater than" field and select either "greater than [field]" or "less than [field]" option and the system should give you the ability to compare your first MA against a 2nd MA.
Note that Barchart.com has the following MA available to add as a filter: 5-Day, 50-Day, 100-Day, 200-Day, and YTD Moving Average.