The difference with a cutter is that all three sails are intended to be flown at once, the advantage being that the sail sizes are smaller and so more manageable. This applies less with modern reliable roller furling
To achieve sail balance the mast
is moved back, and to maintain an adequate flow between the sails ie slot normally a bowsprit
is required. This 4-6 ' may add to marina costs.
The advantage of an inner forestay on a sloop
is to maintain sail shape with roller furling
is difficult reefing beyond around 25%.
It allows a smaller sail to be set with proper shape in higher winds.
The difficulty is that in putting it forard to maintain a slot it interferes with tacking to some degree particularly with the larger genoas. While this is overcomeable it depends how often you tack and the prevailing wind
strengths as to how big a genoa
you need. 130% seems a reasonable compromise.