When two boats share the same hull type — in this case both the Pro-Line 21 cc 2013 and the Pro-Line 23 XP 2013 are modified vee designs with fiberglass 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 — Pro-Line 21 cc 2013 at 21,7 ft versus Pro-Line 23 XP 2013 at 23,0 ft. At 27 lbs and 39 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.
The power gap is worth calling out. Rated to 300 hp, the Pro-Line 23 XP 2013 has a 150-hp advantage over the Pro-Line 21 cc 2013's 150-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Pro-Line 23 XP 2013 carries 125 gallons versus 7 gallons in the Pro-Line 21 cc 2013. 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 Pro-Line 23 XP 2013 is rated for 7 passengers, while the Pro-Line 21 cc 2013 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Pro-Line 23 XP 2013 could be the deciding factor.
Bottom line: Choose the Pro-Line 23 XP 2013 if your priority is putting more people on the water — it handles 7 passengers and at 23,0 ft it has the deck room to back that rating up comfortably. The Pro-Line 21 cc 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.