The Crest Sport Fisherman 18 2005 vs Crest Upper Sundeck 27 2008 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Crest Upper Sundeck 27 2008 measures 27,0 feet overall (2008), giving it roughly 9,0 additional feet of deck space compared to the Crest Sport Fisherman 18 2005 at 18,0 feet (2005). Weight tells a clearer story for trailering families: the Crest Upper Sundeck 27 2008 tips the scales at 3 988 lbs - 2 290 lbs less than the Crest Sport Fisherman 18 2005 at 1 698 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 150 hp, the Crest Upper Sundeck 27 2008 has a 75-hp advantage over the Crest Sport Fisherman 18 2005's 75-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 Crest Upper Sundeck 27 2008 is rated for 15 passengers, while the Crest Sport Fisherman 18 2005 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Crest Upper Sundeck 27 2008 could be the deciding factor.
Bottom line: Choose the Crest Upper Sundeck 27 2008 if your priority is putting more people on the water - it handles 15 passengers and at 27,0 ft it has the deck room to back that rating up comfortably. The Crest Sport Fisherman 18 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.