Both the Larson SEi 180 LX I/O 2007 and the Larson Senza 206 2009 are modified-V designs, both built in fibreglass, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department - Larson SEi 180 LX I/O 2007 at 17,0 ft versus Larson Senza 206 2009 at 20,0 ft. Weight tells a clearer story for trailering families: the Larson Senza 206 2009 tips the scales at 3 150 lbs - 785 lbs less than the Larson SEi 180 LX I/O 2007 at 2 365 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.
The Larson SEi 180 LX I/O 2007 carries a rated maximum of 225 hp. Engine data for the Larson Senza 206 2009 wasn't available in our records - check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Larson Senza 206 2009 carries 35 gallons versus 23 gallons in the Larson SEi 180 LX I/O 2007. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Larson Senza 206 2009 is rated for 10 passengers, while the Larson SEi 180 LX I/O 2007 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson Senza 206 2009 could be the deciding factor.
Bottom line: Choose the Larson Senza 206 2009 if your priority is putting more people on the water - it handles 10 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Larson SEi 180 LX I/O 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.