When two boats share the same hull type — in this case both the Weld-Craft RS 70 (20 ft.) 2007 and the Weld-Craft V & UV Jon Boats 2012 are flat 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 — 40 hp for the Weld-Craft RS 70 (20 ft.) 2007 and 20 hp for the Weld-Craft V & UV Jon Boats 2012. 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 Weld-Craft RS 70 (20 ft.) 2007 is rated for 6 passengers, while the Weld-Craft V & UV Jon Boats 2012 caps at 2. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Weld-Craft RS 70 (20 ft.) 2007 could be the deciding factor.
Bottom line: Choose the Weld-Craft RS 70 (20 ft.) 2007 if your priority is putting more people on the water — it handles 6 passengers and at 2,0 ft it has the deck room to back that rating up comfortably. The Weld-Craft V & UV Jon Boats 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 2 that costs less to run day-to-day.