My husband has put me through both types. Both post-orgasm continuation and orgasm denial. In my opinion I feel like orgasm denial is by far the worse of the two. He knows exactly how to work me to the point where two grazes against my clit would make me cum, but only grants me one and then backs off; then he repeats the whole process until I am nearly in tears begging him to finish me off. Post-orgasm, on the other hand, after a certain point it just seems tedious. Maybe it's because I haven't gotten to that pain threshold, or maybe I have a high pain tolerance, but past the point where I am excited or enjoying orgasming it just feels like a chore.