Both the Lund 2010 Pro Guide 2009 and the Lund A 12 2005 are modified-V designs, both built in aluminium, 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?
Size is the most obvious dividing line here. The Lund 2010 Pro Guide 2009 measures 20,0 feet overall (2009), giving it roughly 8,0 additional feet of deck space compared to the Lund A 12 2005 at 12,0 feet (2005). Weight tells a clearer story for trailering families: the Lund 2010 Pro Guide 2009 tips the scales at 1 440 lbs - 1 275 lbs more than the Lund A 12 2005 at 165 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 power gap is worth calling out. Rated to 115 hp, the Lund 2010 Pro Guide 2009 has a 105-hp advantage over the Lund A 12 2005's 10-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Lund 2010 Pro Guide 2009 is rated for 6 passengers, while the Lund A 12 2005 caps at 3. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund 2010 Pro Guide 2009 could be the deciding factor.
Bottom line: Choose the Lund 2010 Pro Guide 2009 if your priority is putting more people on the water - it handles 6 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Lund A 12 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.