When two boats share the same hull type — in this case both the Tahoe Boats Q4 Sport OB 2009 and the Tahoe Boats Q5i 2011 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 — Tahoe Boats Q4 Sport OB 2009 at 18,0 ft versus Tahoe Boats Q5i 2011 at 19,4 ft. Weight tells a clearer story for trailering families: the Tahoe Boats Q5i 2011 tips the scales at 2 722 lbs — 2 706 lbs less than the Tahoe Boats Q4 Sport OB 2009 at 16 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 220 hp, the Tahoe Boats Q5i 2011 has a 70-hp advantage over the Tahoe Boats Q4 Sport OB 2009's 150-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 23 gal and 23 gal — so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Tahoe Boats Q5i 2011 is rated for 8 passengers, while the Tahoe Boats Q4 Sport OB 2009 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tahoe Boats Q5i 2011 could be the deciding factor.
Bottom line: Choose the Tahoe Boats Q5i 2011 if your priority is putting more people on the water — it handles 8 passengers and at 19,4 ft it has the deck room to back that rating up comfortably. The Tahoe Boats Q4 Sport OB 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.