So for me it's easier to backside boardslide than it is to 50-50. I also have a skate background so that may be why. For others boardsliding may be a little scarier.
When 50-50'ing onto a rail, you have to know how to get up over it, and catch it at an angle from the side to stop from rolling over it (or sliding sideways and catching an edge), which I find to be a little more difficult than it is jumping onto a rail in the boardslide position.
It also helps to learn this stuff on fat round rails with only a slight downward pitch. There is more surface area to catch the rail with your board which reduces room for error, and you can really get the feeling of rolling onto the top of the rail.
Last edited by Extremo; 11-26-2013 at 10:08 AM.