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EVERYONE is correct on this one...
A narrow tailed fish...looser in fast waves, easier to bank at speed.
A narrow tailed fish...stiffer in slow waves, it sinks, doesn't plane, you have to trim from forwards, causing more surface area to come into play...
The speed of the waves is the variable no one mentioned. """""""""""
So what do you really mean by loose? It's kind of a subjective term here. For my part it means the tail doesn't hold a line as well -- loose -- more skatey.
Narrow tails are more positive IMHO.
Getting terminology straight is pretty important or one gets lost quickly.
Mahalo, Rich