Hi Andre, I don't have too much experience with either of those sails - what we generally find is that for Duotone sails - the SPace free ride cam sail works really well on the Blast if your focus is on speed, control etc. If your focus is more on manoeuvres/having a lot of low end power - then the no cam EPace works very well. Just remember the Blast´s are fairly narrow and do not have the biggest fins - so when in doubt, a lighter/more compact sails works much better than a Freerace/super deep profile sail. good luck, hopefully others can add here..