Buy new or old?

[millsy]

My son and I went to a recent boat show near Birmingham UK last weekend. We are looking for our first boat either new or used, not sure which yet either 3 litre new or 4.3 litre used (budget about 14K). We saw the new Maxum 1800 MX with 3 lit. engine which we liked also a Mariah 18 with similar spec.
I know this is a Maxum forum but what do you think Maxum v Mariah?
Buy new or used?

Any help appreciated.
Simon