if there roughly the same price as i found on amazon then id go for the vengeance pro. keep in mind though that there isnt much benefit to be seen in games with ram speed that are higher than around 1866mhz as the price usually outweighs the 4 or 5 fps you would gain. but since in this case they are roughly the same price then go for the faster one.
also check to make sure you cpu and motherboard are compatible with the higher speed so youre not wasteing money on extra speed.