When two boats share the same hull type — in this case both the South Bay 525CR Upper Deck TT 2011 and the South Bay 620C 2008 are pontoon designs with aluminum construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
The power gap is worth calling out. Rated to 225 hp, the South Bay 525CR Upper Deck TT 2011 has a 135-hp advantage over the South Bay 620C 2008's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the South Bay 525CR Upper Deck TT 2011 carries 31 gallons versus 18 gallons in the South Bay 620C 2008. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The South Bay 620C 2008 is rated for 11 passengers, while the South Bay 525CR Upper Deck TT 2011 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the South Bay 620C 2008 could be the deciding factor.
One place where both boats are genuinely identical is tube construction: both run 2 aluminum tubes at 25" diameter. That shared spec means stability and buoyancy characteristics are closely matched — the ride difference you'll feel between them comes primarily from deck length, weight distribution, and motor choice.
Bottom line: Choose the South Bay 620C 2008 if your priority is putting more people on the water — it handles 11 passengers and at 2,0 ft it has the deck room to back that rating up comfortably. The South Bay 525CR Upper Deck TT 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.