pmsl! people say losi shocks are the better choice because they can consistantly build them to a similar standard each time [they are easier to build the same each time
]. and ash a lot of people use them on x6's because that is what the team drivers use so setups are easier to follow etc. whereas the team drivers use them for the reason highlighted above [consistancy] plus most have all the springs and pistons and spares etc. for them.
hope this helps