The Four Winns HD5 RS Surf 2021 is the longer of the two at 26,3 feet overall. The Four Winns 234 Funship 2005 comes in at 25,0 feet, making it roughly 1,3 ft shorter — a meaningful difference in deck room and overall on-water presence.

The Four Winns HD5 RS Surf 2021 has an official capacity rating of 8 people. Capacity data wasn't available for the other model in this comparison — verify directly with the dealer.

Both the Four Winns 234 Funship 2005 and Four Winns HD5 RS Surf 2021 share an 8 ft. 6 in. (2.59 m) beam — meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.

The Four Winns 234 Funship 2005 has the bigger tank at 65 gallons, versus 55 gallons on the Four Winns HD5 RS Surf 2021. That 10-gallon difference translates to roughly 30–50 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Yes — both the Four Winns 234 Funship 2005 and the Four Winns HD5 RS Surf 2021 are built by Four Winns. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.