For me, high rise trousers (>11 inch rise) are best suited to pleats, of which forward pleats are more slimming as they do not bulk outwards from the side like reverse pleats. Very high flat fronts lend themselves to a lot of horizontal creasing. While short rise (<10 inch) trousers are comfortable, they accentuate the stomach, and can be quite restrictive in a fitted flat front. I've sometimes thought that in order to have a comfortable flat front trouser, it almost needs to be bulkier than a pleated trouser, hence ruining the effect.
I very much like those trousers from Vox.