When two boats share the same hull type — in this case both the Mariah R21 2011 and the Mariah R23 2012 are modified vee 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?
On paper these two are close siblings in the size department — Mariah R21 2011 at 21,4 ft versus Mariah R23 2012 at 23,4 ft. At 34 lbs and 4 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 — 300 hp for the Mariah R21 2011 and 320 hp for the Mariah R23 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. Fuel capacity breaks the other way: the Mariah R23 2012 carries 52 gallons versus 36 gallons in the Mariah R21 2011. 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 Mariah R23 2012 is rated for 12 passengers, while the Mariah R21 2011 caps at 1. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mariah R23 2012 could be the deciding factor.
Bottom line: Choose the Mariah R23 2012 if your priority is putting more people on the water — it handles 12 passengers and at 23,4 ft it has the deck room to back that rating up comfortably. The Mariah R21 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 1 that costs less to run day-to-day.