The Bertram 31 Flybridge Cruiser 1974 vs Bertram 33 Sport Fisherman 1979 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 315 hp, the Bertram 33 Sport Fisherman 1979 has a 175-hp advantage over the Bertram 31 Flybridge Cruiser 1974's 140-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Bertram 33 Sport Fisherman 1979 is rated for 10 passengers, while the Bertram 31 Flybridge Cruiser 1974 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Bertram 33 Sport Fisherman 1979 could be the deciding factor.
Bottom line: Choose the Bertram 33 Sport Fisherman 1979 if your priority is putting more people on the water — it handles 10 passengers and at 33,0 ft it has the deck room to back that rating up comfortably. The Bertram 31 Flybridge Cruiser 1974 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 9 that costs less to run day-to-day.