I don't know either of those boat brands very well, so not sure whether you're comparing apples with apples. Are the two boats the same size, same type of boat, same engine size, similar specifications etc? How many hours has the second hand boat done? Is it in as new condition? More details may help uncover what the real differences are.
Like anything though, some brands are a known better quality and have a better reputation, and therefore will command a better price than a comparable product - even though they may appear similar.
Maybe talk to some boat dealers or even google the second hand boat in question to find out what they sold new for, and read any reviews to determine why it would still be worth as much as a comparable, new boat - if indeed they are comparable.
Only other thing I'd say is that even though the second hand boat has a lot of extra features, are they all new and in good condition? What about the engine? Nothing worse than buying a boat with outdated electronics, and finding all the 'extras' are nearly due to be replaced anyways. At least buying new you get to choose exactly how to fit out your boat, plus you get peace of mind of having some warranty on your hull, motor and trailer.
Good luck with your decision.