The Nordic Boats 42 Inferno 2010 is a modified-V design and the Nordic Boats 43 Enforcer 2011 is a catamaran design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Nordic Boats 42 Inferno 2010 at 42,0 ft versus Nordic Boats 43 Enforcer 2011 at 43,0 ft. Weight tells a clearer story for trailering families: the Nordic Boats 42 Inferno 2010 tips the scales at 11 100 lbs - 500 lbs more than the Nordic Boats 43 Enforcer 2011 at 10 600 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
For family outings this is probably the sharpest distinction between the two. The Nordic Boats 43 Enforcer 2011 is rated for 13 passengers, while the Nordic Boats 42 Inferno 2010 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nordic Boats 43 Enforcer 2011 could be the deciding factor.
Bottom line: Choose the Nordic Boats 43 Enforcer 2011 if your priority is putting more people on the water - it handles 13 passengers and at 43,0 ft it has the deck room to back that rating up comfortably. The Nordic Boats 42 Inferno 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 12 that costs less to run day-to-day.