The Pro-Line 31 Walk 2005 vs Pro-Line 33 Express 2005 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 740 hp, the Pro-Line 33 Express 2005 has a 140-hp advantage over the Pro-Line 31 Walk 2005's 600-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 300 gal and 300 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Pro-Line 33 Express 2005 is rated for 10 passengers, while the Pro-Line 31 Walk 2005 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Pro-Line 33 Express 2005 could be the deciding factor.
Bottom line: Choose the Pro-Line 33 Express 2005 if your priority is putting more people on the water - it handles 10 passengers and at 0,0 ft it has the deck room to back that rating up comfortably. The Pro-Line 31 Walk 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 9 that costs less to run day-to-day.