The Avalon CT BF - 20 Foot 2006 vs Avalon Tropic 18 ft. 2009 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 CT BF - 20 Foot 2006 at 20,0 ft versus Avalon Tropic 18 ft. 2009 at 18,0 ft. At 1 580 lbs and 1 600 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling - 90 hp for the Avalon CT BF - 20 Foot 2006 and 75 hp for the Avalon Tropic 18 ft. 2009. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
For family outings this is probably the sharpest distinction between the two. The Avalon CT BF - 20 Foot 2006 is rated for 9 passengers, while the Avalon Tropic 18 ft. 2009 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Avalon CT BF - 20 Foot 2006 could be the deciding factor.
Bottom line: Choose the Avalon CT BF - 20 Foot 2006 if your priority is putting more people on the water - it handles 9 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Avalon Tropic 18 ft. 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.