The Phoenix Boats 618 Pro 2010 vs Phoenix Boats 721 ProXP 2022 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.
The power gap is worth calling out. Rated to 250 hp, the Phoenix Boats 721 ProXP 2022 has a 135-hp advantage over the Phoenix Boats 618 Pro 2010's 115-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Phoenix Boats 618 Pro 2010 carries 36 gallons versus 5 gallons in the Phoenix Boats 721 ProXP 2022. 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 Phoenix Boats 721 ProXP 2022 is rated for 6 passengers, while the Phoenix Boats 618 Pro 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Phoenix Boats 721 ProXP 2022 could be the deciding factor.
Bottom line: Choose the Phoenix Boats 721 ProXP 2022 if your priority is putting more people on the water — it handles 6 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Phoenix Boats 618 Pro 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.