The Avalon Catalina - 18 Foot 2008 vs Avalon Paradise - 20 Foot 2006 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.
On paper these two are close siblings in the size department - Avalon Catalina - 18 Foot 2008 at 18,0 ft versus Avalon Paradise - 20 Foot 2006 at 20,0 ft. Weight tells a clearer story for trailering families: the Avalon Paradise - 20 Foot 2006 tips the scales at 1 700 lbs - 209 lbs less than the Avalon Catalina - 18 Foot 2008 at 1 491 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 100 hp, the Avalon Paradise - 20 Foot 2006 has a 25-hp advantage over the Avalon Catalina - 18 Foot 2008'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 Avalon Paradise - 20 Foot 2006 is rated for 12 passengers, while the Avalon Catalina - 18 Foot 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Avalon Paradise - 20 Foot 2006 could be the deciding factor.
Bottom line: Choose the Avalon Paradise - 20 Foot 2006 if your priority is putting more people on the water - it handles 12 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Avalon Catalina - 18 Foot 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.