The March 2015 NPD sales figures are in and, as noted in the title, Battlefield Hardline and Bloodborne top the software sales for the month.
1.) Battlefield: Hardline (Xbox One, PlayStation 4, 360, PS3, PC)
2.) Bloodborne (PS4)
3.) Grand Theft Auto V (Xbox One, PS4, 360, PS3)
4.) Mario Party 10 (Wii U)
5.) Call of Duty: Advanced Warfare (PS4, Xbox One, 360, PS3, PC)
6.) MLB 15: The Show (PS4, PS3)
7.) Minecraft (360, PS3, Xbox One, PS4)
8.) NBA 2K15 (PS4, Xbox One, 360, PS3, PC)
9.) Borderlands: The Handsome Collection (PS4, Xbox One)
10.) Final Fantasy: Type 0 HD (PS4, Xbox One)

That's quite impressive for Bloodborne and Mario Pary 10, especially when you consider they were only released on one system each.

On the hardware side of things, the PlayStation 4 was once again the top selling console. There are no figures available for either the Xbox One or the PS4 but both companies did issue public statements.
"We are truly honored PlayStation 4 is the top-selling console and No. 1 in software sales again according to NPD sales data for March 2015. PS4 remains the cumulative sales leader both globally and in the United States and we want to thank gamers worldwide for their ongoing support."
- A SCEA Spokesperson

"In March, cumulative U.S. Xbox One sales continued to outpace Xbox 360 sales at the same point in its lifecycle."
- A Microsoft Spokesperson