The Advantage 20.5 Classic BR 2006 vs Advantage 34 Party Cat 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 Advantage 34 Party Cat 2008 measures 34,0 feet overall (2008), giving it roughly 32,0 additional feet of deck space compared to the Advantage 20.5 Classic BR 2006 at 2,0 feet (2006). At 25 lbs and 8 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.
For family outings this is probably the sharpest distinction between the two. The Advantage 34 Party Cat 2008 is rated for 16 passengers, while the Advantage 20.5 Classic BR 2006 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Advantage 34 Party Cat 2008 could be the deciding factor.
Bottom line: Choose the Advantage 34 Party Cat 2008 if your priority is putting more people on the water — it handles 16 passengers and at 34,0 ft it has the deck room to back that rating up comfortably. The Advantage 20.5 Classic BR 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.