This is not absolute, depending on the freshness of the practice and personal taste, red pomfret you are talking about that freshwater white pomfret it is that long like the piranha that fish it, if live steamed nature is also good, braised can also be, but compared to ordinary carp natural penny a penny a good, this fish is more expensive natural good, but compared with the mirror carp or a gap, but the dead is not very tasty.
Carp then ordinary carp I think sweet and sour carp is also good, for example, some rare kinds of Yellow River four holes carp and German mirror carp steamed is also good.
So there is no way to compare the two, I suggest you try both.