When two boats share the same hull type — in this case both the South Bay 420FC - 25 in. Upgrade 2012 and the South Bay 422F 2011 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?
Both boats share a closely matched power ceiling — 90 hp for the South Bay 420FC - 25 in. Upgrade 2012 and 75 hp for the South Bay 422F 2011. 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. Fuel capacity breaks the other way: the South Bay 422F 2011 carries 31 gallons versus 27 gallons in the South Bay 420FC - 25 in. Upgrade 2012. 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 420FC - 25 in. Upgrade 2012 is rated for 10 passengers, while the South Bay 422F 2011 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the South Bay 420FC - 25 in. Upgrade 2012 could be the deciding factor.
Both are 2-tube and 2-tube pontoon designs respectively. Tube diameter and gauge affect stability and load capacity — more so than most buyers realize when comparing on paper.
Bottom line: Choose the South Bay 420FC - 25 in. Upgrade 2012 if your priority is putting more people on the water — it handles 10 passengers and at 19,8 ft it has the deck room to back that rating up comfortably. The South Bay 422F 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.