+Jacqueline Lari did you not watch the video....

+Jacqueline Lari The V2 Grinder is for smaller-to-average surf and the V2-SB is for average-to-excellent surf. There's some overlap in the middle but basically the V2 Grinder is stubbier and flatter for better performance in weaker waves. V2-SB is the "highest performance" board between these two but only when you've got enough of a wave to ride an HP shortboard. For the average or poor days at your local beach, V2 Grinder is the way to go.  
http://www.realwatersports.com/surfing/surfboards/lost/v2-grinder



Hope this helps! -Chris Stellato +realwatersports