The Lagoon 450 is being replaced with the Lagoon 46.
The Lagoon 450 is a very comfortable boat. There is plenty of comfortable seating and it sails well.
The Lagoon 450 comes with two helm options. The 450S has a much smaller and lower set helm. This gives you a lower boom for better access to the mainsail. The smaller helm seating area means you cannot get as many people sitting up by the person at the helm. This style also has lower visibility than the flybridge.
The 450S has better shelter from bad weather than the flybridge.