The Voyager Marine 1770 Bass 2010 is a flat-bottom design and the Voyager Marine 20 ft. Sport Fish Deluxe 2011 is a pontoon 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 - Voyager Marine 1770 Bass 2010 at 17,0 ft versus Voyager Marine 20 ft. Sport Fish Deluxe 2011 at 20,0 ft. Weight tells a clearer story for trailering families: the Voyager Marine 20 ft. Sport Fish Deluxe 2011 tips the scales at 1 550 lbs - 905 lbs less than the Voyager Marine 1770 Bass 2010 at 645 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 90 hp, the Voyager Marine 20 ft. Sport Fish Deluxe 2011 has a 30-hp advantage over the Voyager Marine 1770 Bass 2010's 60-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 Voyager Marine 20 ft. Sport Fish Deluxe 2011 is rated for 10 passengers, while the Voyager Marine 1770 Bass 2010 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Voyager Marine 20 ft. Sport Fish Deluxe 2011 could be the deciding factor.
Bottom line: Choose the Voyager Marine 20 ft. Sport Fish Deluxe 2011 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 Voyager Marine 1770 Bass 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.